Ironically most of the advancements that led to the 1911 average of 48 to the current average of 77 came from refrigeration, childhood vaccinations, and antibiotics. The end of life care we've developed really hasn't improved the quality of life we had 100 years ago if you were a president or other person of means.
Look at Thoreau's family. His sister, Sophia, died at age 56. His brother John died of Tetanus at age 26. Helen died at age 36. Henry died at age 44 from TB. Despite having better than average means, three out of four of the siblings died before the age of 50.
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