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I'm pretty sure that much of our improvement in life expectancy over the past century is due to the reduction in infant mortality.

http://www.livescience.com/10569-human-lifespans-constant-2-...



Absolutely. Life expectancy at birth (in the U.S.) has increased by more than 20 years since 1900. Life expectancy at age 65 has still increased by ~10 years though:

http://www.ssa.gov/oact/NOTES/as120/LifeTables_Body.html#wp1...




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