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Thelema (/ θ ə ˈ l iː m ə /) is a Western esoteric and occult social or spiritual philosophy [1] and a new religious movement founded in the early 1900s by Aleister Crowley (1875–1947), an English writer, mystic, occultist, and ceremonial magician. [2]
The classical theories of evolution (mutation accumulation, antagonistic pleiotropy, and disposable soma) [1] [2] [3] suggest that environmental factors, such as predation, accidents, disease, and/or starvation, ensure that most organisms living in natural settings will not live until old age, and so there will be very little pressure to ...
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]
Despite Charles Darwin's completion of his theory of biological evolution in the 19th century, the modern logical framework for evolutionary theories of aging wouldn't emerge until almost a century later. Though August Weismann did propose his theory of programmed death, it was met with criticism and never gained mainstream attention. [3]
This may be a tradeoff between selecting for cancer and selecting for aging. [36] Modern theories on the evolution of aging include the following: Mutation accumulation is a theory formulated by Peter Medawar in 1952 to explain how evolution would select for aging. Essentially, aging is never selected against, as organisms have offspring before ...
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. At their extremes, the wide spectrum of aging theories can be ...
Strength of natural selection plot as a function of age. The antagonistic pleiotropy hypothesis (APT) is a theory in evolutionary biology that suggests certain genes may confer beneficial effects early in an organism's life, enhancing reproductive success, while also causing detrimental effects later in life, contributing to the aging process.
A major influence on the theory was Emil Kraepelin, lining up degeneration theory with his psychiatry practice. The central idea of this concept was that in "degenerative" illness, there is a steady decline in mental functioning and social adaptation from one generation to the other.