Loss of elastic tissue and collagen causes the skin to sag and wrinkles; weakened blood capillaries cause skin to bruise more easily. This damage is accelerated by exposure to the sun or by smoking.
As we age, the skin produces fewer cells and repairs damaged cells more slowly, while cells in the horny layer of the skin become dryer and rougher. Increasing rigidity, inelasticity and a decrease of dermal collagen and elastin fibers mean the skin begins to wrinkle and sag.
Age also affects hair color, graying or whitening it because of a decrease in the number of melanin-producing cells. Most people also notice thinning and slower hair regrowth rate, while on the other hand, hair begins to appear in unwanted places. Please click on Hair section for further information.