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Menstruation occurs if an egg is not fertilised, in other words if you do not fall pregnant. Past a certain age you're simply too old to be having children, you only have a certain number of eggs in your body and the older you get the less you have so once you start running out you stop ovulating. As you stop ovulating this means that you also stop menstruating. Essentially your reproductive system shuts down when you're too old to have children.

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11y ago

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