<P> Europeans often begin to grow gray hairs in their mid-30s while Asians begin graying in their late 30s, but most Africans retain their original hair color until their mid-40s . </P> <P> Graying is a gradual process; according to a study by L'Oreal, overall, of those between 45 and 65 years old, 74% had some grey hair, covering an average of 27% of their head, and approximately 1 in 10 people had no gray hairs even after the age of 60 . </P> <P> Children born with some hair colors may find it gradually darkens as they grow . Many blond, light brown, or red haired infants experience this . This is caused by genes being turned off and on during early childhood and puberty . </P> <P> Changes in hair color typically occur naturally as people age, eventually turning the hair gray and then white . This is called achromotrichia . Achromotrichia normally begins in the early to mid-twenties in men and late twenties in women . More than 60 percent of Americans have some gray hair by age 40 . The age at which graying begins seems almost entirely due to genetics . Sometimes people are born with gray hair because they inherit the trait . </P>

Why does blonde hair get darker with age
find me the text answering this question