Wrinkles are the result of the effects of time on an individual's skin. As a person gets older, their skin cells begin to divide less rapidly causing the dermis to thin. A decrease in the production of collagen and elastin fibers causes the skin to hang loosely on the face creating the folds known as wrinkles. With age, skin is less able to retain moisture and oil secretions are reduced, further leading to the development of wrinkles.