Adult moths and butterflies are easily distinguished from their caterpillars.
An adult is an animal that has reached full growth.[1] The biological definition of the word means an animal reaching sexual maturity and thus capable of reproduction. In the human context, the term adult has meanings associated with social and legal concepts. In contrast to a non-adult or "minor", a legal adult is a person who has attained the age of majority and is therefore regarded as independent, self-sufficient, and responsible. They may also be regarded as "majors". The typical age of attaining legal adulthood is 18, although definition may vary by legal rights, country, and psychological development.
Human adulthood encompasses psychological adult development. Definitions of adulthood are often inconsistent and contradictory; a person may be biologically an adult, and have adult behavior, but still be treated as a child if they are under the legal age of majority. Conversely, one may legally be an adult but possess none of the maturity and responsibility that may define an adult character.
In different cultures, there are events that relate passing from being a child to becoming an adult or coming of age. This often encompasses passing a series of tests to demonstrate that a person is prepared for adulthood, or reaching a specified age, sometimes in conjunction with demonstrating preparation. Most modern societies determine legal adulthood based on reaching a legally specified age without requiring a demonstration of physical maturity or preparation for adulthood.
Biological adulthood
Historically and cross-culturally, adulthood has been determined primarily by the start of puberty (the appearance of secondary sex characteristics such as menstruation and the development of breasts in women, ejaculation, the development of facial hair, and a deeper voice in men, and pubic hair in both sexes).[2][3] In the past, a person usually moved from the status of child directly to the status of adult, often with this shift being marked by some type of coming-of-age test or ceremony.[4] During the Industrial Revolution, children went to work as soon as they could in order to help provide for their family. There was not a huge emphasis on school or education in general. Many children could get a job and were not required to have experience as adults are nowadays. Adulthood, in more recent years, as it has been studied has developed a characteristic list, that goes far beyond just ones physical maturity.[5] These markers for a full, mentally developed, adult include traits of personal responsibilities in multiple aspects of life.
Although few or no established dictionaries provide a definition for the two-word term biological adult, the first definition of adult in multiple dictionaries includes "the stage of the life cycle of an animal after reproductive capacity has been attained".[6][7] Thus, the base definition of the word adult is the period beginning at physical sexual maturity, which occurs sometime after the onset of puberty. Although this is the primary definition of the base word "adult", the term is also frequently used to refer to social adults. The two-word term biological adult stresses or clarifies that the original definition, based on physical maturity (i.e. having reached reproductive competency), is being used.[8]
The time of puberty varies from child to child, but usually begins between 10 and 12 years old. Girls typically begin the process of puberty at age 10 or 11, and boys at age 11 or 12.[9][10][11] Girls generally complete puberty by 15–17, and boys by age 16 or 17.[11][12] Nutrition, genetics and environment also usually play a part in the onset of puberty.[13] Girls will go through a growth spurt and gain weight in several areas of their body. Boys will go through similar spurts in growth, though it is usually not in a similar style or time frame. This is due to the natural processes of puberty, but genetics also plays a part in how much weight they gain or how much taller they get.[14]
One recent area of debate within the science of brain development is the most likely chronological age for full mental maturity, or indeed, if such an age even exists. Common claims repeated in the media since 2005 (based upon interpretations of imaging data) have commonly suggested an "end-point" of 25, referring to the prefrontal cortex as one area that is not yet fully mature at the age of 18. However, this is based on an interpretation of a brain imaging study by Jay Giedd, dating back to 2004 or 2005, where the only participants were aged up to 21 years, and Giedd assumed this maturing process would be done by the age of 25 years, whereas more recent studies show prefrontal cortex maturation continuing well past the age of 30 years, marking this interpretation as incorrect and outdated.[15][16][17][18][19][20][21]
Legally, adulthood typically means that one has reached the age of majority – when parents lose parental rights and responsibilities regarding the person concerned.[22] Depending on one's jurisdiction, the age of majority may or may not be set independently of and should not be confused with the minimum ages applicable to other activities, such as engaging in a contract, marriage, voting, having a job, serving in the military, buying/possessing firearms, driving, traveling abroad, involvement with alcoholic beverages, smoking, sexual activity, gambling, being a model or actor in pornography, running for president, etc. Admission of a young person to a place may be restricted because of danger for that person, concern that the place may lead the person to immoral behavior, or because of the risk that the young person causes damage (for example, at an exhibition of fragile items).
One can distinguish the legality of acts of a young person, or of enabling a young person to carry out that act, by selling, renting out, showing, permitting entrance, allowing participation, etc. There may be distinction between commercially and socially enabling. Sometimes there is the requirement of supervision by a legal guardian, or just by an adult. Sometimes there is no requirement, but rather a recommendation.
Using the example of pornography, one can distinguish between:
being a pornographic actor: rules for the young person, and for other people, regarding production, possession, etc. (see child pornography)
With regard to films with violence, etc.:
another person being allowed to sell, rent out, or show the young person a film; a cinema being allowed to let a young person enter
The age of majority ranges internationally from ages 15 to 21, with 18 being the most common age. Nigeria, Mali, Democratic Republic of Congo and Cameroon define adulthood at age 15, but marriage of girls at an earlier age is common.[23]
In most of the world, the legal adult age is 18 for most purposes, with some notable exceptions:
Prior to the 1970s, young people were not classed as adults until 21 in most western nations. For example, in the United States, young citizens could not vote in many elections until 21 until July 1971 when the 26th Amendment passed mandating that the right to vote cannot be abridged for anyone 18 or older. The voting age was lowered in response to the fact that young men between the ages of 18 and 21 were drafted into the army to fight in the Vietnam War, hence the popular slogan "old enough to fight, old enough to vote" [27]
Young people under 21 in the US could also not purchase alcohol, purchase handguns, sign a binding contract, or marry without permission from parents. After the voting age was lowered, many states also moved to lower the drinking age (with most states having a minimum age of 18 or 19) and also to lower the age of legal majority (adulthood) to 18. However, there are legal activities where 18 is not the default age of adulthood. There are still some exceptions where 21 (or even higher) is still the benchmark for certain rights or responsibilities. For example, in the US the Gun Control Act of 1968 prohibits those under 21 from purchasing a handgun from a federally licensed dealer (although federal law makes an exception for individuals between the ages of 18 and 20 to obtain one from a private dealer if state law permits.) [28]
As of July 1984, the National Minimum Drinking Age Act mandated that all states raise their respective drinking ages to 21 to create a uniform standard for legally purchasing, drinking, or publicly possessing alcohol with exceptions made for consumption only in private residences under parental supervision and permission. This was done in response to reducing the number of drunk driving fatalities prevalent among young drivers. States that choose not to comply can lose up to 10% of highway funding.[29]
The Credit Card Act of 2009 imposed tougher safeguards for young adults between the ages of 18 and 20 obtaining a credit card. Young adults under the age of 21 must either have a co-signer 21 or older or show proof (usually a source of income) that they can repay their credit card balance.[30] Unless that requirement is met, one must wait until 21 to be approved for a credit card on their own.
The Affordable Care Act of 2010 expands the age that young adults can remain on their parent's health insurance plan up to age 26.[31]
As of December2019[update], the federal government raised the legal age to purchase tobacco and vaping products from 18 to 21.[32] In states where recreational marijuana is legalized, the default age is also 21, though those younger may be able to obtain medical marijuana prescriptions or cards upon seeing a physician.[33]
Gambling also varies from 18 to 21 depending on the state and many rental car companies do not rent cars to those under 21 and have surcharges for drivers under 25 (although this is not codified, and is company policy).
In Quebec, Canada the Quebec legislature in 2020 raised the age one could purchase recreational marijuana from 18 to 21 stepping out of line with most of the country that set a minimum age of 19 (except Alberta, which is 18.) The Quebec government cited the risk that marijuana poses to the brain development of people under 21 as justification for the age raise.[34]
In March 2021, the state of Washington in a 5–4 decision, justices in the Supreme Court of the State of Washington tossed the life without parole sentences of a 19-year-old and a 20-year-old convicted in separate cases of first-degree aggravated murder decades ago, saying, as with juveniles, the court must first consider the age of those under 21 before sentencing them to die behind bars. This comes at a time where there are ongoing debates about whether those between 18 and 20 should be exempted from the death penalty.[35][36][37][38]
In Germany, courts largely sentence defendants under the age of 21 according to juvenile law in a bid to help them reintegrate into society and mete out punishments that fit the crime as well as the offender.
In May 2021, the state of Texas raised the age that one can be an exotic dancer and work and patronize sexually oriented businesses from 18 to 21.[39]
In the UK, there have been many proposals to raise the age that one can buy tobacco from 18 to 21 in an attempt to curb teen and young adult use to get to a "smoke-free" UK by 2030.[40] All of these laws made over the years reflect the growing awareness that young adults, while not children, are still in a transitional stage between adolescence and full adulthood and that there should be policy adjustments or restrictions where necessary, especially where it pertains to activities that carry certain degrees of risk or harm to themselves or others.[41]
At the same time, however, even though the generally accepted age of majority is 18[42] in most nations, there are rights or privileges afforded to adolescents who have not yet reached legal adulthood. In the United States, youth are able to get a part-time job at 14 provided they have a work permit. At 16, one is able to obtain a driver's permit or license depending on state laws and is able to work most jobs (except ones requiring heavy machinery) and consent to sexual activity (depending on the state). At 17, one is able to enlist in the armed forces with parental consent although they cannot be deployed to be in combat roles until age 18.
The voting age for local elections in most American cities is 18. But in five localities nationwide — four of which are in Maryland — 16 and 17-year-olds are eligible to vote. The cities are Takoma Park, Riverdale, Greenbelt, and Hyattsville.[43]
In 2020, students 16 or older in Oakland, California gained the right to vote in school board elections. There is a growing movement to lower the voting age in the US and many other countries from 18 to 16 in hopes of engaging the youth vote and encouraging greater electoral participation. Some countries already have a voting age of 16 which include Austria, Scotland, Argentina, Brazil, Wales, Cuba, and Ecuador.
In Germany, one can purchase beer and wine at the age of 16 although they cannot purchase spirits or hard liquor until 18. The age of consent in Germany is 14 if both partners are under 18. Sexual activity with a person under 18 is punishable if the adult is a person of authority over the minor in upbringing, education, care, or employment.
Social construction of adulthood
In contrast to biological perspectives of aging and adulthood, social scientists conceptualize adulthood as socially constructed.[44][45] While aging is an established biological process, the attainment of adulthood is social in its criteria. In contrast to other perspectives that conceptualize aging and the attainment of adulthood as a largely universal development, regardless of context, nation, generation, gender, race, or social class. Social scientists regard these aspects as paramount in cultural definitions of adulthood.[46]
Further evidence of adulthood as a social construction is illustrated by the changing criteria of adulthood over time. Historically, adulthood in the U.S. has rested on completing one's education, moving away from the family of origin, and beginning one's career.[47][48][49] Other key historical criteria include entering a marriage and becoming a parent. These criteria are social and subjective; they are organized by gender, race, ethnicity, and social class, among other key identity markers. As a result, particular populations feel adult earlier in the life course than do others.[50][51][52][53]
Contemporary experiences of and research on young adults today substitute more seemingly subjective criteria for adulthood which resonate more soundly with young adults' experiences of aging.[51][54] The criteria are marked by a growing "importance of individualistic criteria and the irrelevance of the demographic markers of normative conceptions of adulthood."[55] In particular, younger cohorts' attainment of adulthood centers on three criteria: gaining a sense of responsibility, independent decision-making, and financial independence.[56][57]
Jeffrey Arnett, a psychologist and professor at Clark University in Massachusetts, studied the development of adults and argues that there is a new and distinct period of development in between adolescence and adulthood. This stage, which he calls "emerging adulthood", occurs between the ages of 18 and 25.[58] Arnett describes these individuals as able to take some responsibility for their lives, but still not completely feeling like an adult. Arnett articulates five distinct features that are unique to this period of development: identity exploration, feeling in between, instability, self-focus, and having possibilities.[59] Arnett makes it clear that these 5 aspects of emerging adulthood are only relevant during the life stage of emerging adulthood.[60]
The first feature, identity exploration, describes emerging adults making decisions for themselves about their career, education, and love life. This is a time of life when a young person has yet to finalize these decisions but are pondering them, making them feel somewhere in between adolescent and adult. This leads into a second feature of this phase of life—feeling in between. Emerging adults feel that they are taking on responsibilities but do not feel like a 'full' adult quite yet. Next, the instability feature notes that emerging adults often move around after their high school years whether that is to college, friends' houses, or living with a romantic partner, as well as moving back home with their parents/guardians for a time. This moving around often ends once the individual's family and career have been set. Tagging along with the instability feature is having self-focus. Emerging adults, being away from their parental and societal routines, are now able to do what they want when they want and where they want before they are put back into a routine when they start a marriage, family, and career. Arnett's last feature of emerging adulthood, an age of possibilities, characterizes this stage as one where "optimism reigns".[59] These individuals believe they have a good chance of turning out better than their parents did.[59]
Religion
According to Jewish tradition, adulthood is reached at age 13 for Jewish boys and 12 for Jewish girls in accordance with the Bar or Bat Mitzvah;[61][62] they are expected to demonstrate preparation for adulthood by learning the Torah and other Jewish practices. The Christian Bible and Jewish scripture contain no age requirement for adulthood or marrying, which includes engaging in sexual activity.
The 1983 Code of Canon Law states, "A man before he has completed his sixteenth year of age, and likewise a woman before she has completed her fourteenth year of age, cannot enter a valid marriage".[63] According to The Disappearance of Childhood by Neil Postman, the Christian Church of the Middle Ages considered the age of accountability, when a person could be tried and even executed as an adult, to be age 7. While certain religions have their guidelines on what it means to be an adult, generally speaking, there are trends that occur regarding religiosity as individuals transition from adolescence to adulthood. The role of religion in one's life can impact development during adolescence.[64] The National Library of Medicine (NCBI) highlights some studies that show rates of religiosity declining as people move out of the house and live on their own. Oftentimes when people live on their own, they change their life goals and religion tends to be less important as they discover who they are. Other studies from the NCBI show that as adults get married and have children they settle down, and as they do, there tends to be an increase in religiosity. Everyone's level of religiosity builds at a different pace, meaning that religion relative to adult development varies across cultures and time.[65]
Gender dysphoria (GD) is the distress a person experiences due to a mismatch between their gender identity—their personal sense of their own gender—and their sex assigned at birth. The term replaced the previous diagnostic label of gender identity disorder (GID) in 2013 with the release of the diagnostic manual DSM-5. The condition was renamed to remove the stigma associated with the term disorder. The International Classification of Diseases uses the term gender incongruence instead of gender dysphoria, defined as a marked and persistent mismatch between gender identity and assigned gender, regardless of distress or impairment.
Adolescence is a transitional stage of physical and psychological development that generally occurs during the period from puberty to adulthood. Adolescence is usually associated with the teenage years, but its physical, psychological or cultural expressions may begin earlier or end later. Puberty typically begins during preadolescence, particularly in females. Physical growth and cognitive development can extend past the teens. Age provides only a rough marker of adolescence, and scholars have not agreed upon a precise definition. Some definitions start as early as 10 and end as late as 30. The World Health Organization definition officially designates an adolescent as someone between the ages of 10 and 19.
Development of the human body is the process of growth to maturity. The process begins with fertilization, where an egg released from the ovary of a female is penetrated by a sperm cell from a male. The resulting zygote develops through mitosis and cell differentiation, and the resulting embryo then implants in the uterus, where the embryo continues development through a fetal stage until birth. Further growth and development continues after birth, and includes both physical and psychological development that is influenced by genetic, hormonal, environmental and other factors. This continues throughout life: through childhood and adolescence into adulthood.
A child (pl. children) is a human being between the stages of birth and puberty, or between the developmental period of infancy and puberty. The term may also refer to an unborn human being. In English-speaking countries, the legal definition of child generally refers to a minor, in this case as a person younger than the local age of majority, regardless of their physical, mental and sexual development as biological adults. Children generally have fewer rights and responsibilities than adults. They are generally classed as unable to make serious decisions.
Preadolescence is a stage of human development following middle childhood and preceding adolescence. It commonly ends with the beginning of puberty. Preadolescence is commonly defined as ages 9–12 ending with the major onset of puberty. It may also be defined as simply the 2-year period before the major onset of puberty. Preadolescence can bring its own challenges and anxieties.
In medicine and the social sciences, a young adult is generally a person in the years following adolescence, sometimes with some overlap. Definitions and opinions on what qualifies as a young adult vary, with works such as Erik Erikson's stages of human development significantly influencing the definition of the term; generally, the term is often used to refer to adults in approximately the age range of 18 to 40 years. Some inclusive definitions extend the range into the early to mid 40s, while others end earlier.
Coming of age is a young person's transition from being a child to being an adult. The specific age at which this transition takes place varies between societies, as does the nature of the change. It can be a simple legal convention or can be part of a ritual or spiritual event.
Youth is the time of life when one is young. The word, youth, can also mean the time between childhood and adulthood (maturity), but it can also refer to one's peak, in terms of health or the period of life known as being a young adult. Youth is also defined as "the appearance, freshness, vigor, spirit, etc., characteristic of one, who is young". Its definitions of a specific age range varies, as youth is not defined chronologically as a stage that can be tied to specific age ranges; nor can its end point be linked to specific activities, such as taking unpaid work, or having sexual relations.
The Tanner scale is a scale of physical development as pre-pubescent children transition into adolescence, and then adulthood. The scale defines physical measurements of development based on external primary and secondary sex characteristics, such as the size of the breasts, length of the penis, volume of the testes, and growth of pubic hair. This scale was first quantified in 1969 by James Tanner, a British pediatrician, after a two-decade-long study following the physical changes in girls undergoing puberty.
Erikson's stages of psychosocial development, as articulated in the second half of the 20th century by Erik Erikson in collaboration with Joan Erikson, is a comprehensive psychoanalytic theory that identifies a series of eight stages that a healthy developing individual should pass through from infancy to late adulthood.
Gender dysphoria in children (GD), also known as gender incongruence of childhood, is a formal diagnosis for distress caused by incongruence between assigned sex and gender identity in some pre-pubescent transgender and gender diverse children.
James E. Marcia is a clinical and developmental psychologist. He taught at Simon Fraser University in British Columbia, Canada and the State University of New York at Buffalo in Upstate New York.
Emerging adulthood, early adulthood, or post-adolescence refers to a phase of the life span between late adolescence and early adulthood, as initially proposed by Jeffrey Arnett in a 2000 article from American Psychologist. It primarily describes people living in developed countries, but it is also experienced by young adults in wealthy urban families in the Global South. The term describes young adults who do not have children, do not live in their own homes, and/or do not have sufficient income to become fully independent. Arnett suggests emerging adulthood is the distinct period between 20 and 29 years of age where young adults become more independent and explore various life possibilities.
Spermarche, also known as semenarche, is the time at which a male experiences his first ejaculation. It is considered to be the counterpart of menarche in females. Depending on upbringing, cultural differences, and prior sexual knowledge, males may have different reactions to spermarche, ranging from fear to excitement. Spermarche is one of the first events in the life of a male leading to sexual maturity. It occurs at the time when the secondary sex characteristics are just beginning to develop. Researchers have had difficulty determining the onset of spermarche because it is reliant on self-reporting. Other methods to determine it have included the examination of urine samples to determine the presence of spermatozoa. The presence of sperm in urine is referred to as spermaturia.
According to Alberts, Elkind, and Ginsberg the personal fable "is the corollary to the imaginary audience. Thinking of themselves as the center of attention, the adolescent comes to believe that it is because they are special and unique.” It is found during the formal operational stage in Piagetian theory, along with the imaginary audience. Feelings of invulnerability are also common. The term "personal fable" was first coined by the psychologist David Elkind in his 1967 work Egocentrism in Adolescence.
Puberty is the process of physical changes through which a child's body matures into an adult body capable of sexual reproduction. It is initiated by hormonal signals from the brain to the gonads: the ovaries in a female, the testicles in a male. In response to the signals, the gonads produce hormones that stimulate libido and the growth, function, and transformation of the brain, bones, muscle, blood, skin, hair, breasts, and sex organs. Physical growth—height and weight—accelerates in the first half of puberty and is completed when an adult body has been developed. Before puberty, the external sex organs, known as primary sexual characteristics, are sex characteristics that distinguish males and females. Puberty leads to sexual dimorphism through the development of the secondary sex characteristics, which further distinguish the sexes.
In psychology, maturity can be operationally defined as the level of psychological functioning one can attain, after which the level of psychological functioning no longer increases much with age. However, beyond this, integration is also an aspect of maturation, such as the integration of personality, where the behavioral patterns, motives and other traits of a person are gradually brought together, to work together effectively with little to no conflict between them, as an organized whole, e.g., bringing a person's various motives together into a purpose in life. Case in point: adult development and maturity theories include the purpose in life concept, in which maturity emphasizes a clear comprehension of life's purpose, directedness, and intentionality, which contributes to the feeling that life is meaningful.
The relationship between media and American adolescent sexuality explores how media influences the sexual development of American teenagers and shapes its portrayal.
Jeffrey Jensen Arnett is a professor in the Department of Psychology at Clark University in Massachusetts. His main research interest is in "emerging adulthood", a term he coined, which refers to the distinct phase between adolescence and young adulthood, occurring from the ages of 18 to 25.
Alcoholism in adolescence, though less common than in adults, presents a unique set of dangers due to the developing brain's vulnerability to alcohol's effects. Alcohol can cause harm and even damage to a person's DNA. "Alcohol consumption is recognized worldwide as a leading risk factor for disease, disability, and death" and is rated as the most used substance by adolescences. Adolescence is a transitional stage of physical and psychological changes, usually a time in a person life in which they go through puberty. Combining these transitional stages and the intake of alcohol can leave a number of consequences for an adolescent.
↑ SETTERSTEN, RICHARD (2015). "Becoming adult: Meanings of markers to adulthood"(PDF). Emerging Trends in the Social and Behavioral Sciences: An Interdisciplinary, Searchable, and Linkable Resource: 1–16 – via umnikizdes.
↑ Marantz Henig, Robin (2010-08-18). "What Is It About 20-Somethings?". The New York Times. p.10. Archived from the original on 2011-05-11. Retrieved 2010-09-24. The Discovery of adolescence is generally dated to 1904, with the publication of the massive study "Adolescence," by G. Stanley Hall, a prominent psychologist and first president of the American Psychological Association.
↑ "Has Fecundability been Declining in Recent Years in Developed Countries?". Journal of Biosocial Science. 15 (1). January 1983. doi:10.1017/s0021932000006349. ISSN0021-9320.
↑ Becker; Landau, Sidney I., eds. (1986). International dictionary of medicine and biology. Wiley. ISBN0-471-01849-X. OCLC801872498.
↑ Schuiling, Kerri Durnell; Likis, Frances E. (2016). Women's Gynecologic Health. Jones & Bartlett Learning. p.22. ISBN978-1-284-12501-6. Archived from the original on January 10, 2023. Retrieved March 20, 2018. The changes that occur during puberty usually happen in an ordered sequence, beginning with thelarche (breast development) at around age 10 or 11, followed by adrenarche (growth of pubic hair due to androgen stimulation), peak height velocity, and finally menarche (the onset of menses), which usually occurs around age 12 or 13.
1 2 Phillips, D. C. (2014). Encyclopedia of Educational Theory and Philosophy. SAGE Publications. pp.18–19. ISBN978-1-4833-6475-9. Archived from the original on January 10, 2023. Retrieved March 20, 2018. On average, the onset of puberty is about 18 months earlier for girls (usually starting around the age of 10 or 11 and lasting until they are 15 to 17) than for boys (who usually begin puberty at about the age of 11 to 12 and complete it by the age of 16 to 17, on average).
↑ Ge, Xiaojia; Natsuaki, Misaki N.; Neiderhiser, Jenae M.; Reiss, David (2007). "Genetic and Environmental Influences on Pubertal Timing: Results From Two National Sibling Studies". Journal of Research on Adolescence. 17 (4): 767–788. doi:10.1111/j.1532-7795.2007.00546.x.
↑ Settersten, Richard A. Jr. (2 December 2018). Lives in time and place: the problems and promises of developmental science. Taylor & Francis. ISBN978-0-415-78421-4. OCLC1121019775.[pageneeded]
↑ Elder, Glen H., ed. (1985). "Perspectives on the life course". Life course dynamics: trajectories and transitions, 1968-1980. Cornell University Press. pp.23–49. ISBN0-8014-9323-4. OCLC469306035.
↑ Ryff, Carol D. (16 January 2018). "The Subjective Experience of Life-Span Transitions". In Rossi, Alice S. (ed.). Gender and the life course. Routledge. pp.97–113. ISBN978-1-351-32902-6. OCLC1028167964.
↑ Arnett, Jeffrey Jensen (1998). "Learning to Stand Alone: The Contemporary American Transition to Adulthood in Cultural and Historical Context". Human Development. 41 (5/6): 295–315. doi:10.1159/000022591. JSTOR26763368. S2CID143862036.
↑ Shanahan, Michael J. (August 2000). "Pathways to Adulthood in Changing Societies: Variability and Mechanisms in Life Course Perspective". Annual Review of Sociology. 26 (1): 667–692. doi:10.1146/annurev.soc.26.1.667. JSTOR223461.
↑ Arnett, Jeffrey Jensen (2003). "Conceptions of the Transition to Adulthood Among Emerging Adults in American Ethnic Groups". New Directions for Child and Adolescent Development. 2003 (100): 63–76. doi:10.1002/cd.75. PMID12955983.
↑ Barrett, Anne E. (May 2005). "Gendered experiences in midlife: Implications for age identity". Journal of Aging Studies. 19 (2): 163–183. doi:10.1016/j.jaging.2004.05.002.
↑ Settersten, Richard A. Jr.; Furstenberg, Frank F.; Rumbaut, Rubén G., eds. (15 April 2008). "On the Frontier of Adulthood: Emerging Themes and New Directions". On the frontier of adulthood: theory, research, and public policy. University of Chicago Press. pp.3–25. ISBN978-0-226-74890-0. OCLC191752480.
↑ Shanahan, Michael J.; Porfeli, Erik J.; Mortimer, Jeylan T.; Erickson, Lance D. (15 April 2008). "Subjective Age Identity and the Transition to Adulthood: When do Adolescents Become Adults?". In Settersten, Richard A. Jr.; Furstenberg, Frank F.; Rumbaut, Rubén G. (eds.). On the frontier of adulthood: theory, research, and public policy. University of Chicago Press. pp.225–255. ISBN978-0-226-74890-0. OCLC191752480.
↑ Arnett, Jeffrey Jensen (2014). Emerging adulthood: the winding road from the late teens through the twenties. Oxford University Press. ISBN978-0-19-992938-2. OCLC945977734.[pageneeded]
↑ Waters, Mary C.; Carr, Patrick J.; Kefalas, Maria J.; Holdaway, Jennifer (15 April 2008). "Becoming Adult: Meanings and Markers for Young Americans". In Settersten, Richard A. Jr.; Furstenberg, Frank F.; Rumbaut, Rubén G. (eds.). On the frontier of adulthood: theory, research, and public policy. University of Chicago Press. pp.169–190. ISBN978-0-226-74890-0. OCLC191752480.
↑ Donelson, Elaine (1999). "Psychology of religion and adolescents in the United States: Past to present". Journal of Adolescence. 22 (2): 187–204. doi:10.1006/jado.1999.0212. PMID10089119.
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