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I've been asked when my very first period was, too. It's usually to help determine if everything has been healthy with you over the years. For example, a girl who didn't start her period until 19 or 20, might have completely different issues than one that started at 9. It could also signal just how long you've been having one (so 20 years vs 30 could make a difference to what you should be tested for, when menopause might kick in, etc).