evolutionary theory
of aging:- it hypothesizes difference in the aging process
occurs due to interplay between the process of mutation and natural
selection. And also it's States natural selection has not
eliminates many harmful conditions and non adaptive characters in
older adults. And natural selection is linked to reproductive
fitness.
supportive evidence of
mutation accumulation:- Huntingdon disease, low level of
aberrant protein accounts for aging.
harmonal stress
theory:- this theory states that, aging in the bodies
harmonal system can lower resistance to stress and increases the
likelihood of disease.