Apparent age

Although the skin is itself a protection against radiation, this protection brings with it consequences of its own, leading to an 'apparent age' that is greater than one's real age.
    The appearance of an individual's face and hands are often used as a rapid measure of age. Comparing the appearance of the face and forearms with that of less exposed areas demonstrates the major differences between intrinsic and photoaged skin.

Skin creases and lines

The differences in skin surface markings between young and mature skin that has always been protected are only slight. In the older skin there will have been some natural loss of collagen and elastin, but no other significant damage.

A young baby has the normal skin creases on the hands and face, but very few elsewhere on the body.