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  1. 1 Νοε 2015 · This article will explore several common theories about why and how we age. By understanding current aging theories, clinicians can follow advances in aging research and intelligently address patient questions about life extension therapies and strategies to slow aging.

  2. Theories of aging can be divided into two categories: those that answer the question “Why do we age?” and those that address the. question “How do we age?” Only a few broad, overarching theories attempt to explain why we and nearly all living organisms age.

  3. Three major psychosocial theories have been proposed to attempt to explain successful aging. These include the activity theory, disengagement theory and the continuity theory.

  4. 22 Οκτ 2023 · Modern biological theories of aging in humans currently fall into two main categories: programmed and damage or error theories.

  5. The free radical theory of aging, first proposed by Denham Harman (36), holds that damage caused by oxygen radicals is responsible for many of the bodily changes that accompany aging.

  6. Aging can be seen as an irreversible, time-dependent, functional decline that converts healthy adults into frail ones, with reduced capacity to adjust to everyday stresses, and increasing vulnerability to most diseases, and to death (1).

  7. Several theories may explain the normal aging process, either alone or in combination with other theories (Table 1). These theories can be generally classified into evolutionary, involving historical and evolutionary aspects of aging, and physiologic or structural and functional changes.