My mom (adoptive) started going gray in her 20s and it went quick. For years she dyed her hair until some health complications cause the Dr.s to tell her not to anymore. When it was finally natural again... it was white! She's now 60something and her hair is this amazing platinum color. Meanwhile, I'm 29 (almost) and no sign of gray yet... which is amazing considering who my cats are... not to mention DH.