Exfoliation is the process by which dead cells are removed from the skin. When we are younger, this process naturally occurs at a rate of about every 28 days. As we age, this renewal slows down resulting in thick skin called keratin (accumulation of dead skin cells). This will result in a rough, discolored and uneven texture, clogged pores, and a dull, lifeless looking complexion.
On the other hand, age spots appear on the body as it ages, and are due to over or uneven production of melanin, resulting from a localized aggregation of melanocytes. They appear most frequently in areas exposed to sunlight, i.e. the face, neck, hands and the top of bald heads.