Having periods: You have to be old enough to have periods. The age at which a girl starts her period varies by genetics and weight and fat percentage. The average age in the us nowadays is around 12-13, but of course some girls start before age ten and some after age 16. Moodiness like pms comes along with the hormones, but so do wonderfully female bodies and minds.
Answered 9/21/2017
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Whenever you start: getting periods - you are now old enough to potentially have PMS.
Answered 9/22/2017
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