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Human life expectancy is a statistical measure of the estimate of the average remaining years of life at a given age. The most commonly used measure is life expectancy at birth. This can be defined in two ways. Cohort LEB is the mean length of life of a birth cohort and can be computed only for cohorts born so long ago that all their members have died. Period LEB is the mean length of life of a hypothetical cohort assumed to be exposed, from birth through death, to the mortality rates observed at a given year. National LEB figures reported by national agencies and international organizations for human populations are estimates of period LEB.
Longevity may refer to especially long-lived members of a population, whereas life expectancy is defined statistically as the average number of years remaining at a given age. For example, a population's life expectancy at birth is the same as the average age at death for all people born in the same year.
Old age is the range of ages for people nearing and surpassing life expectancy. People of old age are also referred to as: old people, elderly, elders, seniors, senior citizens, or older adults. Old age is not a definite biological stage: the chronological age denoted as "old age" varies culturally and historically. Some disciplines and domains focus on the aging and the aged, such as the organic processes of aging (senescence), medical studies of the aging process (gerontology), diseases that afflict older adults (geriatrics), technology to support the aging society (gerontechnology), and leisure and sport activities adapted to older people.
Gerontology is the study of the social, cultural, psychological, cognitive, and biological aspects of aging. The word was coined by Ilya Ilyich Mechnikov in 1903, from the Greek γέρων (gérōn), meaning "old man", and -λογία (-logía), meaning "study of". The field is distinguished from geriatrics, which is the branch of medicine that specializes in the treatment of existing disease in older adults. Gerontologists include researchers and practitioners in the fields of biology, nursing, medicine, criminology, dentistry, social work, physical and occupational therapy, psychology, psychiatry, sociology, economics, political science, architecture, geography, pharmacy, public health, housing, and anthropology.
Population ageing is an increasing median age in a population because of declining fertility rates and rising life expectancy. Most countries have rising life expectancy and an ageing population, trends that emerged first in developed countries but are now seen in virtually all developing countries. That is the case for every country in the world except the 18 countries designated as "demographic outliers" by the United Nations. The aged population is currently at its highest level in human history. The UN predicts the rate of population ageing in the 21st century will exceed that of the previous century. The number of people aged 60 years and over has tripled since 1950 and reached 600 million in 2000 and surpassed 700 million in 2006. It is projected that the combined senior and geriatric population will reach 2.1 billion by 2050. Countries vary significantly in terms of the degree and pace of ageing, and the UN expects populations that began ageing later will have less time to adapt to its implications.
The USC Leonard Davis School of Gerontology is one of the seventeen academic divisions of the University of Southern California in Los Angeles, focusing on undergraduate and graduate programs in gerontology.
India's population in 2021 as per World Bank is 1.39 billion. Being the world's most populous country and one of its fastest-growing economies, India experiences both challenges and opportunities in context of public health. India is a hub for pharmaceutical and biotechnology industries; world-class scientists, clinical trials and hospitals yet country faces daunting public health challenges like child undernutrition, high rates of neonatal and maternal mortality, growth in noncommunicable diseases, high rates of road traffic accidents and other health related issues.
Disability-adjusted life years (DALYs) are a measure of overall disease burden, expressed as the number of years lost due to ill-health, disability, or early death. It was developed in the 1990s as a way of comparing the overall health and life expectancy of different countries.
In demography and medical geography, epidemiological transition is a theory which "describes changing population patterns in terms of fertility, life expectancy, mortality, and leading causes of death." For example, a phase of development marked by a sudden increase in population growth rates brought by improved food security and innovations in public health and medicine, can be followed by a re-leveling of population growth due to subsequent declines in fertility rates. Such a transition can account for the replacement of infectious diseases by chronic diseases over time due to increased life span as a result of improved health care and disease prevention. This theory was originally posited by Abdel Omran in 1971.
Following is a list of topics related to life extension:
Health is the state of complete physical, mental, and social well-being and a positive concept emphasizing social and personal resources, as well as physical capacities. This article lists major topics related to personal health.
Frailty is a common geriatric syndrome that embodies an elevated risk of catastrophic declines in health and function among older adults. Frailty is a condition associated with ageing, and it has been recognized for centuries. It is a marker of a more widespread syndrome of frailty, with associated weakness, slowing, decreased energy, lower activity, and, when severe, unintended weight loss. As a frequent clinical syndrome in the elderly, various health risks are linked to health deterioration and frailty in older age, such as falls, disability, hospitalization, and mortality. Generally, frailty refers to older adults who lose independence. It also links to the experiences of losing dignity due to social and emotional isolation risk. Frailty has been identified as a risk factor for the development of dementia.
Jean-Marie Robine is a French social scientist, who works in the field of demography and gerontology, and is an author and journalist, who is best known as being the co-validator of the longevity of Jeanne Calment, the oldest verified supercentenarian of all time, with whom he collaborated.
Ageing is the process of becoming older. The term refers mainly to humans, many other animals, and fungi, whereas for example, bacteria, perennial plants and some simple animals are potentially biologically immortal. In a broader sense, ageing can refer to single cells within an organism which have ceased dividing, or to the population of a species.
Singapore is one of the wealthiest countries in the world, with a gross domestic product (GDP) per capita of more than $57,000. Life expectancy at birth is 82.3 and infant mortality is 2.7 per 1000 live births. The population is ageing and by 2030, 20% will be over 65. However it is estimated that about 85% of those over 65 are healthy and reasonably active. Singapore has a universal health care system.
According to the World Bank income level classification, Portugal is considered to be a high income country. Its population was of 10,283,822 people, by 1 July 2019. WHO estimates that 21.7% of the population is 65 or more years of age (2018), a proportion that is higher than the estimates for the WHO European Region.
The Mexican Health and Aging Study (MHAS), also known by its Spanish name, Estudio Nacional de Salud y Envejecimiento en México, ENASEM, is the first panel study of health and aging in Mexico. The first phase of MHAS was supported by a grant from the MHAS was supported by a grant from the National Institutes of Health/National Institute on Aging. The study was a collaborative effort among researchers from the Universities of Pennsylvania, Maryland, and Wisconsin in the U.S., and the Instituto Nacional de Estadística, Geografia e Informática.
Brunei's healthcare system is managed by the Brunei Ministry of Health and funded by the General Treasury. It consists of around 15 health centers, ten clinics and 22 maternal facilities, considered to be of reasonable standard. There are also two private hospitals. Cardiovascular disease, cancer, and diabetes are the leading cause of death in the country, with life expectancy around 75 years, a vast improvement from 1961. Brunei's human development index (HCI) improved from 0.81 in 2002 to 0.83 in 2021, expanding at an average annual rate of 0.14%. According to the UN's Human Development Report 2020, the HCI for girls in the country is greater than for boys, though aren't enough statistics in Brunei to break down HCI by socioeconomic classes. Brunei is the second country in Southeast Asia after Singapore to be rated 47th out of 189 nations on the UN HDI 2019 and has maintained its position in the Very High Human Development category. Being a culturally taboo subject, the rate of suicide has not been investigated.
The male-female health-survival paradox, also known as the morbidity-mortality paradox or gender paradox, is the phenomenon in which female humans experience more medical conditions and disability during their lives, but they unexpectedly live longer than males. This paradox, where females experience greater morbidity (diseases) but lower mortality (death) in comparison to males, is unusual since it is expected that experiencing disease increases the likelihood of death. However, in this case, the part of the population that experiences more disease and disability is the one that lives longer.
Dementia and Alzheimer's disease in Australia is a major health issue. Alzheimer's disease is the most common type of dementia in Australia. Dementia is an ever-increasing challenge as the population ages and life expectancy increases. As a consequence, there is an expected increase in the number of people with dementia, posing countless challenges to carers and the health and aged care systems. In 2018, an estimated 376,000 people had dementia; this number is expected to increase to 550,000 by 2030 and triple to 900,000 by 2050. The dementia death rate is increasing, resulting in the shift from fourth to second leading cause of death from 2006 to 2015. It is expected to become the leading cause of death over the next number of years. In 2011, it was the fourth leading cause of disease burden and third leading cause of disability burden. This is expected to remain the same until at least 2020.
References
- ↑ "Eileen M Crimmins, TRENDS Scholar".
- ↑ Communications, USC Leonard Davis (November 21, 2022). "Uncovering the Secrets of SuperAgers".
- ↑ "National Academy of Sciences Members and Foreign Associates Elected". Archived from the original on 2016-05-06. Retrieved 2016-05-05.
- ↑ Crimmins, Eileen; Mark D. Hayward; Yasuhiko Saito (February 1994). "Changing Mortality and Morbidity Rates and the Health Status and Life Expectancy of the Older Population". Demography. 31 (1): 159–175. doi: 10.2307/2061913 . JSTOR 2061913. PMID 8005340. S2CID 207356863.
- ↑ Information on years of promotions are taken both from the subject's c.v. (http://www-rcf.usc.edu/~crimmin/cv.pdf) and the U.S.C. Aging Nexus (http://www.usc.edu/projects/nexus/faculty/dept-ldsg/crimminseileen/CrimminsBio.pdf Archived 2007-02-03 at the Wayback Machine )
- ↑ "Editorial Board". Biodemography & Social Biology.
- ↑ Surinder K. Mehta, review in The Annals of the American Academy, 20.2 (1987), p. 210
- ↑ Bakalar, Nicholas (2010-12-27). "Aging: Paying the Physical Price for Longer Life". New York Times. Retrieved 26 March 2012.
- ↑ Boffey, Philip M. (1983-05-31). "LONGER LIVES SEEN AS THREAT TO NATION'S BUDGET". New York Times. Retrieved 26 March 2012.
- ↑ Daniel Callahan; Sherwin B. Nuland (2011-05-19). "The Quagmire: How American medicine is destroying itself". The New Republic. Retrieved 26 March 2012.
- ↑ Crimmins, Eileen; M.D. Hayward; H.Ueda; Y. Saito; J.K. Kim (2008). "Life With and Without Heart Disease among Women and Men over 50". Journal of Women & Aging. 20 (1–2): 5–19. doi:10.1300/j074v20n01_02. PMC 2994551 . PMID 18581697.
- ↑ Suthers, K; Kim, JK; Crimmins, E (May 2003). "Life expectancy with cognitive impairment in the older population of the United States". The Journals of Gerontology. Series B, Psychological Sciences and Social Sciences. 58 (3): S179-86. doi: 10.1093/geronb/58.3.s179 . PMID 12730319.
- ↑ Crimmins, Eileen; Mark D. Hayward; Aaron Hagedorn; Yasuhiko Saito; Nicolas Brouard (2009). "Change in Disability-Free Life Expectancy for Americans 70 Years Old and Over". Demography. 40 (3): 627–646. doi:10.1353/dem.0.0070. PMC 2831348 . PMID 19771948.
- ↑ Reynolds, Sandra L.; Yasuhiko Saito; Eileen Crimmins (2005). "The Impact of Obesity on Active Life Expectancy in Older American Men and Women". The Gerontologist. 45 (4): 438–444. doi: 10.1093/geront/45.4.438 . PMID 16051906.
