You'd definitely expect a modern human to live longer than one of our earliest ancestors, but researchers say that most of that gap has been created in the last hundred years, not the last million. While it took millions of years to create the first big difference in life-span between generations, this new gap has occurred in the last four generations...an "astronomically fast"growth...check it out...
http://www.livescience.com/23989-human-life-span-jump-century.html
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