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The web site, Gravity and Levity, has a great article on the Gompertz law and the odds of surviving through your next year of life. At age 32, I’m looking at just over a 1 in 1500 chance of making it through the year. Exponential decay is sharp, but an exponential within an exponential is so sharp that I can say with 99.999999% certainty that no human will ever live to the age of 130. (Ignoring, of course, the upward shift in the lifetime distribution that will result from future medical advances) ...