Discuss Theories of ageing.

Theories of aging seek to explain the biological, psychological, and social changes that occur as individuals grow older. These theories can be broadly categorized into two groups: biological theories and psychosocial theories. Each of these groups encompasses a range of perspectives that highlight different aspects of the aging process.

Biological Theories of Aging

1. Programmed Theories: These theories propose that aging follows a biological timetable, much like development. The theories suggest that aging is predetermined and genetically programmed, influencing the onset of certain aging processes. One such theory is the *Hayflick Limit*, which posits that somatic cells can only divide a certain number of times (about 40 to 60 times) before they become senescent. This phenomenon is linked to telomere shortening, where the protective caps on chromosomes shorten with each cell division, eventually leading to cell death. Another programmed theory is the *Genetic Control Theory*, which suggests that genes regulate the aging process, including the rate of cell turnover and the body’s ability to repair itself.

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