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.
It's also the average age of a typical single mum and when women's hair starts to turn grey. For men, this is also when they start to worry about losing their locks, as hereditary hair loss affects 40 per cent of men to some degree by the time they are 35. 36 The average age of urban-dwellers (compared to 42 for the rural population). 37 The average age of couples approved for adoption.