With aging, the outer skin layer (epidermis) thins even though the number of cell layers remains unchanged. The number of pigment-containing cells (melanocytes) decreases, but the remaining melanocytes increase in size. Aging skin thus appears thinner, more translucent. Age spots or liver spots may appear in sun-exposed areas. Changes in the connective tissue reduce the skin's strength and elasticity. This is known as elastosis and is especially pronounced in sun-exposed areas.