Interesting article. In my dad's side of the family, we seem to have an interesting inherited trait. We don't really have any balding, but the men (including m

Interesting article. In my dad's side of the family, we seem to have an interesting inherited trait. We don't really have any balding, but the men (including me) go grey very early in life. I'm turning 40 in a couple of days but my beard has turned almost completely grey by now and I have a lot of grey in my hair. My eyebrows are holding on though. My dad and his brothers were all mostly grey by the end of their 30's as well. Interestingly, when my dad got cancer in his mid 50's and started undergoing radiation treatment, the hair on his chin started growing back brown. By the time he passed away about 2 years after, that part of his beard was his original hair color from when he was young. One hypothesis is that perhaps due to the damage being done from the radiation to healthy tissue encouraged stem cells to migrate back to that area and had the effect of regenerating the melanocytes in the follicles in the area.