Is it all genetic?

Is it all genetic?

How early we gray is determined by our genes, or more specifically, the family code for “turning off” the metabolism of melanocytes (melanin-producing cells). But the genetic connection isn’t exactly clear. While early graying may cluster in some families, scientists have not been able to attribute it to a single gene or a common gene. And because there are infinite individual variations, we might as well look to other contributing causes. You’ll find these in "Gray Hair Biology 101" and "The First Frost of Aging?".