Definition Normal changes occur in the hair and nails as people age. Aging can affect the hair and nails in different ways. One of the most obvious changes that occurs with age is gray hair.
Hair color comes from a pigment or color produced by the skin.
The skin makes less pigment as a person gets older. Often, the genes determine when the hair starts to turn gray. Rarely, gray hair can begin as early as the late teen years. Many people begin to have gray hair in their 30s. Other people are in their 50s or older before they lose hair color.