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Aging theories based on evolvability; Aging theories based on group selection; Antagonistic pleiotropy hypothesis; C. Cross-linking theory of aging; D. Disposable ...
The two theories; non-adaptive, and adaptive, are used to explain the evolution of senescence, which is the decline in reproduction with age. [8] The non-adaptive theory assumes that the evolutionary deterioration of human age occurs as a result of accumulation of deleterious mutations in the germline. [8]
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
In 1968 it took the form and became known as the neuroendocrine theory of aging. [38] [39] [40] 1956 Denham Harman proposed the free-radical theory of aging and demonstrated that free radical reactions contribute to the degradation of biological systems. [41] The theory is based on the ideas of Rebeca Gerschman and her colleagues put forward in ...
Disengagement theory was formulated by Cumming and Henry in 1961 in the book Growing Old and was the first theory of aging that social scientists developed. [5] Thus, the theory has historical significance in gerontology. Since then, it has faced strong criticism since the theory was proposed as innate, universal, and unidirectional. [6]
Ageism is a social inequality resulting from age stratification. This is a sociological concept that comes with studying aging population. [3] Age stratification within a population can have major implications, affecting things such as workforce trends, social norms, family structures, government policies, and even health outcomes.
There are also data which query whether, as activity theory implies, greater social activity is linked with well-being in adulthood. [55] Selectivity theory mediates between the activity and disengagement theories and suggests that it may benefit older people to become more active in some aspects of their lives and more disengaged in others. [55]
Aging theories based on group selection; Antagonistic pleiotropy hypothesis; C. Cross-linking theory of aging; D. Disposable Soma Theory; DNA damage theory of aging; E.