Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

a theory of biological aging proposing that aging stems from a build-up of trauma to cells, tissues, and organs inside the body elicited by climate-related or external factors. This generates the weakening and ultimate demise of the organs, cells, and tissues.

WEAR-AND-TEAR THEORY OF AGING: "The wear-and-tear theory of aging implies that as individuals grow older, their exposure to damaging variables increase which causes their health to weaken. "

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