map (function, iterable, ...) Â¶ Apply function to every item of iterable and return a list of the results. If additional iterable arguments are passed, function must take that many arguments and is applied to the items from all iterables in parallel.
The grey hair ârule of thumbâ is that by the age of 50, half of the population have lost the colour in 50% of their hair. When researchers tested this rule, they found that 74% of people aged between 45 and 65 had grey hair, with an average intensity of 27%.Generally, men have more grey hair than women.he grey hair ârule of thumbâ is that by the age of 50, half of the population have lost the colour in 50% of their hair. When researchers tested this rule, they found that 74% of people aged between 45 and 65 had grey hair, with an average intensity of 27%. Generally, men have more grey hair than women.
As you age the follicles lose their pigmentation. Hair isn't actually grey its white, but it looks grey   Why hair turns gray as we agePremature graying can happen at any a â¦ ge ...generally from the 20's up. I knew a young man in Elementary school who had a tin can thrown at him which cut the scalp and he had a patch of white hair about two inches in diameter.s you age the follicles lose their pigmentation. Hair isn't actually grey its white, but it looks grey   Why hair turns gray as we agePremature graying can happen at any a â¦ ge ...