Skin laxity is partly the result of the natural aging process. As we age, our body produces less collagen and elastin, which are essential fibers that give our skin structure and support. Sun damage can also break these fibers down further, worsening the effect of aging. As your skin loses its collagen content, it becomes thinner and looser. While the underlying cause of skin laxity is aging, there are several other factors that can contribute. Smoking, sun damage, genetics, and lifestyle can all affect the health of your skin and make it age faster. Loose, excess skin on the body can also result from pregnancy or weight loss.