In modern times, yes, some girls even start their periods as young 9 but a hundred years ago, and later, girls routinely could be as old as 17 before they started. In poorer areas it was getting married, and started to have sex, which would start a girls periods. There is theories that say its the amount of hormones in our diets but its just a theory. At least thats what I read on the subject some years ago.
Bro, bad nutrition was the thing that make some woman get their periods late, is not "the amount of hormones in our diets".
+ mental problems, Bulimia and anorexia, can delay the period or even "remove" for X amount of time. I go back and repeat: bad nutrition or a bad diet (i mean not eating the necessary, like at leat the 3 meals per day) is what "delays" menstruation
How old is ran most girls start their periods before 15 or younger