There is no "normal" since every body is different.
Do most girls have periods when they're 10? No, it is a little young for girls in the USA.
Do ANY girls have periods when they're 10? Of course. Some girls begin their periods at 8, 9, or 10 years old in the USA.
...it's kind of like asking "Is it normal to be 5' 6" tall?" For some people it is "normal," but for others it is not.
ANSWER 2
I am 8, i started my periods last year, they are really heavy. I do have a bone age of 14 if that makes any difference and i am 5" 2", yep you heard me, im taller than 3 of the teachers at my school.
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