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Selectivity theory (aging) Socioemotional selectivity theory; Stage-crisis view; Stem cell theory of aging; Stereotype embodiment theory; T. Telomere theory of aging; V.
Biodemography is a multidisciplinary approach, integrating biological knowledge (studies on human biology and animal models) with demographic research on human longevity and survival.
This is an accepted version of this page This is the latest accepted revision, reviewed on 13 February 2025. Biological process of getting older This article is about ageing specifically in humans. For the ageing of whole organisms including animals, see Senescence. For other uses, see Ageing (disambiguation). Part of a series on Human growth and development Stages Gamete Zygote Embryo Fetus ...
Geography of aging or gerontological geography is an emerging field of knowledge of human geography that analyzes the socio-spatial implications of aging of the population from the understanding of the relationships between the physical-social environment and the elderly, at different scales, micro (city, region, country), etc.
The somatic mutation theory of ageing states that accumulation of mutations in somatic cells is the primary cause of aging. A comparison of somatic mutation rate across several mammal species found that the total number of accumulated mutations at the end of lifespan was roughly equal across a broad range of lifespans. [ 16 ]
Genetic theories of aging propose that aging is programmed within each individual's genes. According to this theory, genes dictate cellular longevity. Programmed cell death, or apoptosis, is determined by a "biological clock" via genetic information in the nucleus of the cell. Genes responsible for apoptosis provide an explanation for cell ...
Aging by design theory; Aging theories based on evolvability; Aging theories based on group selection; Antagonistic pleiotropy hypothesis; C. Cross-linking theory of ...
According to this theory, life span development has multiple trajectories (positive, negative, stable) and causes (biological, psychological, social, and cultural). Individual variation is a hallmark of this theory – not all individuals develop and age at the same rate and in the same manner. [15] Bronfenbrenner's ecological theory