Longevity Explained

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 (in the case of cohorts).

Longevity studies may involve putative methods to extend life. Longevity has been a topic not only for the scientific community but also for writers of travel, science fiction, and utopian novels. The legendary fountain of youth appeared in the work of the Ancient Greek historian Herodotus.

There are difficulties in authenticating the longest human life span, owing to inaccurate or incomplete birth statistics. Fiction, legend, and folklore have proposed or claimed life spans in the past or future vastly longer than those verified by modern standards, and longevity narratives and unverified longevity claims frequently speak of their existence in the present.

A life annuity is a form of longevity insurance.

Life expectancy, as of 2010

See main article: List of countries by life expectancy.

Various factors contribute to an individual's longevity. Significant factors in life expectancy include gender, genetics, access to health care, hygiene, diet and nutrition, exercise, lifestyle, and crime rates. Below is a list of life expectancies in different types of countries:[1]

77–90 years (e.g. Canada: 81.29 years, 2010 est.)

32–80 years (e.g. Mozambique: 41.37 years, 2010 est.)

Population longevities are increasing as life expectancies around the world grow:[2] [3]

80 years in 2002, 81.72 years in 2010

79.05 years in 2002, 81.09 years in 2010

77.78 years in 2002, 79.41 years in 2010

79.25 years in 2002, 80.33 years in 2010

81.56 years in 2002, 82.84 years in 2010

79.12 years in 2002, 79.73 years in 2011

79.06 years in 2002, 81.07 years in 2010

80 years in 2002, 81.73 years in 2010

77.4 years in 2002, 78.24 years in 2010

Long-lived individuals

The Gerontology Research Group validates current longevity records by modern standards, and maintains a list of supercentenarians; many other unvalidated longevity claims exist. Record-holding individuals include:[4] [5] [6]

Major factors

Evidence-based studies indicate that longevity is based on two major factors: genetics and lifestyle.[9]

Genetics

Twin studies have estimated that approximately 20-30% of the variation in human lifespan can be related to genetics, with the rest due to individual behaviors and environmental factors which can be modified.[10] Although over 200 gene variants have been associated with longevity according to a US-Belgian-UK research database of human genetic variants[11] these explain only a small fraction of the heritability.[12]

Lymphoblastoid cell lines established from blood samples of centenarians have significantly higher activity of the DNA repair protein PARP (Poly ADP ribose polymerase) than cell lines from younger (20 to 70 year old) individuals.[13] The lymphocytic cells of centenarians have characteristics typical of cells from young people, both in their capability of priming the mechanism of repair after sublethal oxidative DNA damage and in their PARP gene expression.[14] These findings suggest that elevated PARP gene expression contributes to the longevity of centenarians, consistent with the DNA damage theory of aging.[15]

In July 2020 scientists, using public biological data on 1.75 m people with known lifespans overall, identify 10 genomic loci which appear to intrinsically influence healthspan, lifespan, and longevity – of which half have not been reported previously at genome-wide significance and most being associated with cardiovascular disease – and identify haem metabolism as a promising candidate for further research within the field. Their study suggests that high levels of iron in the blood likely reduce, and genes involved in metabolising iron likely increase healthy years of life in humans.[16] [17]

Lifestyle

Longevity is a highly plastic trait, and traits that influence its components respond to physical (static) environments and to wide-ranging life-style changes: physical exercise, dietary habits, living conditions, and pharmaceutical as well as nutritional interventions.[18] [19] [20] A 2012 study found that even modest amounts of leisure time physical exercise can extend life expectancy by as much as 4.5 years.[21]

Diet

See main article: Diet and longevity. As of 2021, there is no clinical evidence that any dietary practice contributes to human longevity.[22]

Biological pathways

Four well-studied biological pathways that are known to regulate aging, and whose modulation has been shown to influence longevity are Insulin/IGF-1, mechanistic target of rapamycin (mTOR), AMP-activating protein kinase (AMPK), and Sirtuin pathways.[23] [24]

Autophagy

Autophagy plays a pivotal role in healthspan and lifespan extension.[25]

Change over time

In preindustrial times, deaths at young and middle age were more common than they are today. This is not due to genetics, but because of environmental factors such as disease, accidents, and malnutrition, especially since the former were not generally treatable with pre-20th-century medicine. Deaths from childbirth were common for women, and many children did not live past infancy. In addition, most people who did attain old age were likely to die quickly from the above-mentioned untreatable health problems. Despite this, there are several examples of pre-20th-century individuals attaining lifespans of 85 years or greater, including John Adams, Cato the Elder, Thomas Hobbes, Christopher Polhem, and Michelangelo. This was also true for poorer people like peasants or laborers. Genealogists will almost certainly find ancestors living to their 70s, 80s and even 90s several hundred years ago.

For example, an 1871 census in the UK (the first of its kind, but personal data from other censuses dates back to 1841 and numerical data back to 1801) found the average male life expectancy as being 44, but if infant mortality is subtracted, males who lived to adulthood averaged 75 years. The present life expectancy in the UK is 77 years for males and 81 for females, while the United States averages 74 for males and 80 for females.

Studies have shown that black American males have the shortest lifespans of any group of people in the US, averaging only 69 years (Asian-American females average the longest).[26] This reflects overall poorer health and greater prevalence of heart disease, obesity, diabetes, and cancer among black American men.

Women normally outlive men. Theories for this include smaller bodies that place lesser strain on the heart (women have lower rates of cardiovascular disease) and a reduced tendency to engage in physically dangerous activities.[27] Conversely, women are more likely to participate in health-promoting activities.[28] The X chromosome also contains more genes related to the immune system, and women tend to mount a stronger immune response to pathogens than men.[29] However, the idea that men have weaker immune systems due to the supposed immuno-suppressive actions of testosterone is unfounded.[30]

There is debate as to whether the pursuit of longevity is a worthwhile health care goal. Bioethicist Ezekiel Emanuel, who is also one of the architects of ObamaCare, has argued that the pursuit of longevity via the compression of morbidity explanation is a "fantasy" and that longevity past age 75 should not be considered an end in itself.[31] This has been challenged by neurosurgeon Miguel Faria, who states that life can be worthwhile in healthy old age, that the compression of morbidity is a real phenomenon, and that longevity should be pursued in association with quality of life.[32] Faria has discussed how longevity in association with leading healthy lifestyles can lead to the postponement of senescence as well as happiness and wisdom in old age.[33]

Naturally limited longevity

Most biological organisms have a naturally limited longevity due to aging, unlike a rare few that are considered biologically immortal.

Given that different species of animals and plants have different potentials for longevity, the disrepair accumulation theory of aging tries to explain how the potential for longevity of an organism is sometimes positively correlated to its structural complexity. It suggests that while biological complexity increases individual lifespan, it is counteracted in nature since the survivability of the overall species may be hindered when it results in a prolonged development process, which is an evolutionarily vulnerable state.[34]

According to the antagonistic pleiotropy hypothesis, one of the reasons biological immortality is so rare is that certain categories of gene expression that are beneficial in youth become deleterious at an older age.

Myths and claims

See main article: Longevity myths and Longevity claims. Longevity myths are traditions about long-lived people (generally supercentenarians), either as individuals or groups of people, and practices that have been believed to confer longevity, but for which scientific evidence does not support the ages claimed or the reasons for the claims.[35] [36] A comparison and contrast of "longevity in antiquity" (such as the Sumerian King List, the genealogies of Genesis, and the Persian Shahnameh) with "longevity in historical times" (common-era cases through twentieth-century news reports) is elaborated in detail in Lucian Boia's 2004 book Forever Young: A Cultural History of Longevity from Antiquity to the Present and other sources.[37]

After the death of Juan Ponce de León, Gonzalo Fernández de Oviedo y Valdés wrote in Historia General y Natural de las Indias (1535) that Ponce de León was looking for the waters of Bimini to cure his aging.[38] Traditions that have been believed to confer greater human longevity also include alchemy,[39] such as that attributed to Nicolas Flamel. In the modern era, the Okinawa diet has some reputation of linkage to exceptionally high ages.[40]

Longevity claims may be subcategorized into four groups: "In late life, very old people often tend to advance their ages at the rate of about 17 years per decade .... Several celebrated super-centenarians (over 110 years) are believed to have been double lives (father and son, relations with the same names or successive bearers of a title) .... A number of instances have been commercially sponsored, while a fourth category of recent claims are those made for political ends ...."[41] The estimate of 17 years per decade was corroborated by the 1901 and 1911 British censuses.[41] Time magazine considered that, by the Soviet Union, longevity had been elevated to a state-supported "Methuselah cult".[42]

Robert Ripley regularly reported supercentenarian claims in Ripley's Believe It or Not!, usually citing his own reputation as a fact-checker to claim reliability.[43]

Non-human biological longevity

See main article: List of long-living organisms. Longevity in other animals can shed light on the determinants of life expectancy in humans, especially when found in related mammals. However, important contributions to longevity research have been made by research in other species, ranging from yeast to flies to worms. In fact, some closely related species of vertebrates can have dramatically different life expectancies, demonstrating that relatively small genetic changes can have a dramatic impact on aging. For instance, Pacific Ocean rockfishes have widely varying lifespans. The species Sebastes minor lives a mere 11 years while its cousin Sebastes aleutianus can live for more than 2 centuries.[44] Similarly, a chameleon, Furcifer labordi, is the current record holder for shortest lifespan among tetrapods, with only 4–5 months to live.[45] By contrast, some of its relatives, such as Furcifer pardalis, have been found to live up to 6 years.[46]

There are studies about aging-related characteristics of and aging in long-lived animals like various turtles and plants like Ginkgo biloba trees.[47] They have identified potentially causal protective traits and suggest many of the species have "slow or [times of] negligible senescence" (or aging).[48] [49] [50] The jellyfish T. dohrnii is biologically immortal and has been studied by comparative genomics.[51] [52]

Honey bees (Apis mellifera) are eusocial insects that display dramatic caste-specific differences in longevity. Queen bees live for an average of 1-2 years, compared to workers who live on average 15-38 days in summer and 150-200 days in winter.[53] Worker honey bees with high amounts of flight experience exhibit increased DNA damage in flight muscle, as measured by elevated 8-Oxo-2'-deoxyguanosine, compared to bees with less flight experience.[54] This increased DNA damage is likely due to an imbalance of pro- and anti-oxidants during flight-associated oxidative stress. Flight induced oxidative DNA damage appears to hasten senescence and reduce longevity in A. mellifera.[54]

Examples of long-lived plants and animals

Currently living

over 4,850-year-old bristlecone pine in the White Mountains of California, the oldest currently living non-clonal tree.[55]

Dead

Artificial animal longevity extension

Gene editing via CRISPR-Cas9 and other methods has significantly altered lifespans in animals.[62] [63]

See also

References

Sources

External links

Notes and References

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  3. The US Central Intelligence Agency, 2002, CIA World Factbook, retrieved 12 January 2011, theodora.com
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