More and more gray stripes in your brown hair. Do you know that? Learn something about dying stem cells and pigment production
Hair becomes gray when no more pigment is produced for it by the stem cells.
In men, those cells begin to die around the age of 25, in women around the age of 30.
But it can also be sooner or later; a hereditary factor plays a role.
The route to gray hair
Stem cells in the upper skin layers develop into melanin-producing cells: melanocites. They end up at the bottom of the hair follicle.
The melanocites forming pigment, that gives the hair its characteristic color. The melanocites then transport the pigment to the hair
With the years the stem cells off. No more melanocites are produced and the hair turns gray.
The process differs per hair type and bag; not all hairs turn gray at the same time. Nose hair often comes first and then head hair, beard, body hair and finally the eyebrows.