1.Lit. a lightening of the hair caused by aging or hereditary factors. (*Typically: get ~ have ~ give someone ∼.) I get more gray hair the older I get.I guess my genes give me gray hair.
2.Fig. a lightening of the hair caused by stress or frustration. (*Typically: get ~ have ~ give someone ∼.) I'm getting gray hairs because I have three teenage boys.I have gray hair from raising four kids.