The life span of a human skin cell is about 100 days in children and about 50 days in a normal 35-year old adult. As we get older, cell life-span shortens, and we are more prone to bruising, wrinkling and burning from the sun. It allegedly takes about two weeks for a new cell to work its way to the surface as a dead surface-dwelling cell; and we are urged to apply sunscreen at least 30 minutes before being exposed to direct ultraviolet rays.
I saw a video of Paris Hilton sitting in the sun applying sunscreen to her exposed skin. It was doing her no good.
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