We've all heard the advertisements. "This product fights the 7 visible signs of skin aging!" When researchers (and marketing professionals and physicians) talk about the visible signs of skin aging, they're talking about certain characteristics of the skin. Our skin definitely changes as we age, in several ways. Most of us know about fine lines and wrinkles, but there are a number of other changes, from a tendency to dry skin to brown spots and pigmentation. Loss of radiance