The first onset of gray hair and the speed at which people go gray varies considerably from person to person. Most people actually start going gray in their late 20s but they don't notice it immediately. Premature graying is defined as gray hair onset before late teens for Caucasians and before age 30 in Africans and Asians, or alternatively 50% or more gray scalp hair before age 50. Very occasionally, a few gray hairs can develop in children as young as 8 years and yet it indicates nothing other than an early onset of the gray hair that we all develop with increasing age. Typical gray hair first develops at age 34.2 +/- 9.6 years in Caucasians while for Black people the average age of onset is 43.9 +/-10.3 years (Keogh 1965). As a rough guide, 50% of the population in the US and Europe have 50% gray hair by age 50.