When we are younger, an abundance of elastin, collagen and glycosaminoglycans (GAG) keeps our skin looking smooth, taut and wrinkle-free. As we age, the decrease in collagen, elastin and GAG production results in the formation of wrinkles and sagging skin. Several external factors such as exposure to the sun, pollution and chemicals can lead to premature aging of the skin. Here are a few things you can do to slow down the aging process and protect your skin from showing signs of premature aging.