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Metaphysics of presence (German: Metaphysik der Anwesenheit) is a view held by Martin Heidegger in Being and Time that holds the entire history of Western philosophy is based on privileging presence over absence. [1] Another translation of presence and absence is effectivity and possibility.
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]
Selectivity theory (aging) Socioemotional selectivity theory; Stage-crisis view; Stem cell theory of aging; Stereotype embodiment theory; T. Telomere theory of aging; V.
Biogerontology should not be confused with geriatrics, which is a field of medicine that studies the treatment of existing disease in aging people, rather than the treatment of aging itself. There are numerous theories of aging, and no one theory has been entirely accepted.
The mutation accumulation theory of aging was first proposed by Peter Medawar in 1952 as an evolutionary explanation for biological aging and the associated decline in fitness that accompanies it. [1] Medawar used the term 'senescence' to refer to this process.
Mechanistic evidence was provided by Denham Harman's free radical theory of aging, created in the 1950s. This theory stated that organisms age over time due to the accumulation of damage from free radicals in the body. [4] It also showed that metabolic processes, specifically the mitochondria, are prominent producers of free radicals. [4]
Biomedical theories hold that one can age successfully by caring for physical health and minimizing loss in function, whereas psychosocial theories posit that capitalizing upon social and cognitive resources, such as a positive attitude or social support from neighbors, family, and friends, is key to aging successfully. [7]
Ageing (or aging in American English) is the process of becoming older until death. 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 .