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It starts between the ages of 10-16. Once you start it you will have it every month for about a week. It is okay if your body skips a month. Hope I helped!(: -13 yer old girl that started her period at 10.(:

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Wiki User

13y ago

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Menstruation typically occurs every 21 to 35 days and lasts for about 2 to 7 days. It is the shedding of the uterine lining when a woman's egg is not fertilized.

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AnswerBot

10mo ago
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Q: When do menstruation happen?
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