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We, by contrast, have a risk of death which doubles every eight years. This doesn’t start out so bad: aged 30, your odds of dying that year are less than 1 in 1,000. However, if you keep on doubling something it can start small but, eventually, get very large very quickly: at 65, your risk of death that year is 1 percent; at 80, 5 percent; and by 90, if you make it that far, your odds of not making your 91st birthday are a sobering one in six. There is some evidence that this relationship flattens out after the age of 105 or so, meaning that these exceptionally long-lived people might have technically stopped aging—but, with odds of death around 50 percent per year by then, they might wish it had flattened out slightly sooner.
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