I am an MD. No one really knows, but it is true that most mammals turn grey around the mouth first, consequently progressing up the head. (Check out an infirm dog or cat if you don't believe me). The earliest grey on the head is usually found on the temple, which is short for the Latin "temporal region" meaning the region of "time" i.e. age. As to why we be in motion grey at all, to be precise a hard interrogate also. It appears that old age is preprogrammed into our cell, and someday we may be able to thwart this programming, giving us adjectives eternal youth. But would society be better off? knotty to say.
The grey functions also a a seniority sight in masculine hierarchies, and as the head fleece in homo sapiens is regularly depleted, the beard, grey, and with voluminous size, remains as marker of dominance.
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