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Intrinsic Changes, Extrinsic Changes, Growth And Changes In Color, Skin Cancer, Conditions Of The Normal Aging Skin

The existence of two different types of aging of the human skin has been recognized only since the mid-1980s. Normal internal (intrinsic) changes are differentiated from the effects of external influences (extrinsic). These differences have been made more apparent by a dramatic increase in life expectancy. The average life expectancy in ancient Rome was 22 years, compared with 78.6 years in Canada in 1996.

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Medicine EncyclopediaAging Healthy - Part 4