Why Does Hair Turn Gray as We Age?

You Should Know: Ever wondered why hair eventually turns gray? Well, it comes down to melanin — or the eventual lack of it. Every strand of hair gets its color from this natural pigment made in your hair follicles. Your hair moves through growth cycles that last years, and follicles pump out fresh melanin at the start of each one. After somewhere between seven and 15 of these cycles, melanin production stops for good, and then new white or gray hair grows in without pigment.

Going Deeper: Genetics determines much of the timeline for all this. If your parents grayed early, then you probably will too. Stress also plays a role because when your body goes into fight-or-flight mode, it releases norepinephrine, which pushes melanin-producing cells out of the follicle. Certain medications and vitamin deficiencies can also speed the process along.

Takeaway: There’s no medical treatment that reliably restores color once it’s gone, though managing stress might slow the process. Hair dye remains the main option if any gray strands are bothering you.

Bottom Line: When and if you go gray comes down to biology and time, so it’s mostly outside your control.