On average, yes, it's 12 when they become women. That said, there are precocious cases. My grnamd ahad her first period and her tits began to bud when she was 10.

It's not impossible for a girl to have it at age 10.

Besides, it's not like lowering the age of marriage to 9 or below is a focal point.

Us "hebenazis" would take 12 as a sufficient victory