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.
Asker's rating. 1  Much as grey hair is an indication of age, just as with humans, it's not necessarily so. 2  Dogs age differently just like people. 3  Depends entirely on the dog. 4  some dogs do start showing grey hairs at 4-5 years old.. some start greying at a later age. Just like people, individuals can age at different rates. The best way to determine a dog's age is by having the vet examine the teeth, he can give a fair guess at the age based on the amount of wear and tear, and tartar build up..