I come from a long line of premature gray heads, mine started seriously getting gray at 31yrs old--in my teens and 20's I had put blonde/white streaks in my hair (what a pain) and decided that allowing it to gray would basically do that without the hassle! So started just allowing it to be gray/white. Now at 64 about the only part that is not white or gray is a strand at the nap. I do use one of those "purple" shampoos about once every 4-6 weeks to strip out the yellow that all white heads get from air pollution & hair products.