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Why is it that our hair – and for men, our beard – goes white while the other hair on our head (eyebrows and eyelashes) stays its original colour?
Ron Dippold
San Diego, California, US
Eyebrows and eyelashes can go white if you live long enough. About 15 per cent of people over the age of 70 have white lashes, and lots have white eyebrow hairs. My dad had both. But they generally stay darker longer than head hair – why? Greying isn’t fully understood, but the vague consensus seems to be that follicles – complex machines that grow hair – in the scalp and beard work…
