Wrinkles are a natural by-product of the aging process. With age, skin cells divide more slowly. The inner layer of the skin, called the dermis, begins to thin. The network of elastin and collagen fibers, which support the outer layer, loosens and unravels. This process results in depressions on the skin surface. With aging, skin becomes more fragile. Also, oil-secreting glands are less efficient, making the skin less able to retain moisture and appear more wrinkled. All of these factors contribute to the development of wrinkles.