At present, aging processes are the scope of many research programs, focusing in particular on slowing down the progress of catabolic processes, ie decay. Factors responsible for the aging process can be divided into two basic groups: the natural aging process (intrinsic aging) and the influence of external factors (extrinsic / photo-aging). It is worth emphasizing that external factors account for 80% of the changes observed in the first five decades of life.

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