Wrinkles can be on the surface of the skin or can be quite deep.
Skin loses its strength and elasticity, or ability to stretch, as a person ages. This makes the skin less able to smooth out, which is thought to be part of the cause of wrinkles and skin sagging seen in the elderly. Sun exposure also contributes to the development of wrinkles. Symptoms of wrinkles include deeply formed lines and fine, crinkling crosshatch marks. Skin that is wrinkled may also have a tough, leathery appearance if the person has had a lot of exposure to the sun.