The average age of menarche (beginning of menstruation) is 12.5 years of age in the US. Less than 10% of U.S. girls start to menstruate before 11 years of age, and 90% of all US girls are menstruating by 13.75 years of age.
Age of first menstruation depends upon many factors, including genetics and nutrition. If your mother had her first period at a late age, chances are that you will, too. If you are small or anorexic, you may get your first period at a later age than someone of normal weight.
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WELL YOU CAN BE FROM 10 YRS OF AGE TO BEING 18 YRS OF AGE TO GET YOUR PERIOD
also you can be around 8 yrs. My friend got hers at the age of 8. The lastest you can probably get it is at 18. but that's doubtful. It depends on how mature you are.Or you can be 20 my freinds mom got hers at 20 it realy does not matter of age you just have to be a gir NOT A BOY
How old you are when you start your period varies; the menstrual cycle can start at any time usually between the ages of 9 and 13 years old although some girls may get them later than that.