Although skin has many layers, it can be roughly divided into 3 main portions. Each layer also contains connective tissue, with collagen fibers to give support and elastin fibers to provide flexibility and strength. Skin changes are related to environmental factors, genetic makeup, nutrition and other factors. The greatest single factor, though, is sun exposure. This can be seen by comparing areas of your body that have regular sun exposure with areas that are protected from sunlight.
Natural pigments seem to provide some protection against sun-induced skin damage.
Aging skin thus appears thinner, more pale , and translucent. Changes in the connective tissue reduce the skin's strength and elasticity. Elastosis produces the leathery, weather-beaten appearance common to farmers, sailors, and others who spend a large portion of their life outdoors. Sebaceous glands produce less oil. Men experience a minimal decrease, usually after 80 years old.