Aging begins roughly after age 25, when the renewal of cells begins to slow down. However, it may take another few years before the first signs of aging skin begins to show. Mature skin has wrinkles, dry skin, and often under-eye puffiness. Use a moisturiser with more antioxidants that give your skin the nourishment it needs. Moisturising the skin and protecting it from sunlight helps prevent aging. There are moisturizers with SPF (sun protection factor).