Exactly how long humanity would take to go extinct if we stopped having children

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What would happen if no one else were born? The question seems to be drawn from a science fiction novel, but it has very real and profound implications. If humanity stopped reproducing itself overnight, our fate would be sealed: without new generations, time on Earth for humans would have an expiration date.The countdown would start slowly.While most people do not live more than 100 years, that does not mean that extinction would be immediate.In…