Agin is a progressive deterioration of physiological function, an intrinsic age-related process of loss of viability and increase in vulnerability

As we can see here:

http://aging.healthyfoodscience.com/aging-aging-definition

The problems with this definitions is that Aging is defined primary as the effects but not the causes.

Aging: a persistent decline in the age-specific fitness components of an organism due to internal physiological deterioration (Rose, 1991).

 

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