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2. Greying of hair - Wikipedia

   en.wikipedia.org/wiki/Greying_of_hair

   Changes in hair colour typically occur naturally as people age, eventually turning the hair grey and then white. This normally begins in the early to mid-twenties in men and late twenties in women. More than 60 percent of Americans have some grey hair by age 40. The age at which greying begins seems almost entirely due to genetics. Sometimes ...

3. Promising New Study Says Gray Hair May Be Reversible - AOL

   www.aol.com/lifestyle/could-gray-hair-reversible...

   The reason for hair turning gray may have to do with stem cells and hair follicles, a new study finds. Here, experts if gray hair could be reversible.

4. Help! Why Do I Have Gray Hair in My 20s?!? - AOL

   www.aol.com/help-why-gray-hair-20s-162500136.html

   A derm explains why hair can start turning gray early, specifically in your 20s. ... "stress has been shown to contribute to the depletion of stem cells responsible for hair color," says Dr ...

5. Human hair color - Wikipedia

   en.wikipedia.org/wiki/Human_hair_color

   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.

6. A Study Says Gray Hair May Be Reversible - AOL

   www.aol.com/lifestyle/study-says-gray-hair-may...

   A study links graying hair to stem cells getting stuck, unable to color new hair growth. And here's the good news: That might mean gray hair is reversible.

7. Premature greying of hair - Wikipedia

   en.wikipedia.org/wiki/Premature_greying_of_hair

   This overproduction causes depletion of the melanocyte stem cells which are required to produce melanin, the pigment responsible for hair color. [2] Premature greying of hair has been observed with greater frequency among certain families, suggesting a familial predisposition for the condition.