For the most part, skin that you perceive as being old is probably sun-damaged. It's true that skin gradually breaks down as you age, but if your skin had never been touched by the sun, the look and feel of old skin wouldn't show up until very late in life. Protecting your skin from the sun is the most significant thing you can do to prevent wrinkles, sagging and discoloration. Smoking also ages your skin before its time -- it reduces blood flow to the skin, which leads to wrinkles -- and interferes with the skin's natural defense againstfree radicals.
source from http://beauty.ivillage.com
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