Exposure to the sun damages cells in the epidermis, causing the cells to die and slough off. the body loses thousands of these cells each day. how do you think the skin is maintained?

Simple actually. The Dermis is the layer of skin responsible for maintaining the look and healthiness of the skin, as well as maintaining itself. The Dermis will constantly produce cells in its lifetime that will travel upward replacing the skin that had fallen

Health maintenance organization