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In 1990, biodemographers Olshansky, Carnes, and Cassel published a review in Science entitled "In Search of Methuselah: Estimating the Upper Limits to Human Longevity" (250:634-640). In the article they argued that, despite the astounding increase in life expectancy during the 20th century (increasing, in the United States, from a mean age of 45 at the beginning of the century to 78 at its end), it was doubtful that we would witness an increase in longevity to ages older than 85 during the foreseeable future. This, they argued, reflected "entropy in the life table": it would be far more difficult to
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