because genetics.
if you live to be 80 years old, odds are that only 10% of 80 year olds live to 90, and it drops off from there with each year.
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Yeah, every time you have a birthday, (apart from between 17 and 22) the likelihood you will die until before next becomes 9% more likely
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well, that's certainly a cheery thought... but the math doesn't add up. if it did, you'd never live to be 35 years old.