Life expectancy is rising even corrected for infant mortality.
if 50% of all people died at birth and the rest at 120 that gives avg age of 60.
This means to get n avg age higher more people would have live longer than 20 years just to reach 70.
So more people are living to 70+ to make the avg. with max age 120 that mean avg minimum age today is 20 or higher. The more people living above 70 the higher avg minimum age must be.

"Yet running beneath the surface there has been a core rate of cancer, the legacy of being multicellular creatures in an imperfect world. There is no compelling evidence that this baseline is much different now than it was in ancient times."
http://discovermagazine.com/2013/julyaug/16-history-cancer-afflicted-peo...

I agree with the article that really it's life expectancy at birth, not life expectancy after your childhood years (having escaped death at birth, illnesses etc. etc.). Obviously if someone makes it to 80 and someone dies at birth the average is 40. However I feel that this is just an article on Statistical semantics. It's all well and good making it to 80 in Rome say but not if you happen to be one of the large proportion that died before they were 15. Living in an era where "Life expectancy at birth" is much greater than the stone age is surely preferable, including for the many mothers that also died in childbirth. "We all live to the same average age" if we avoid the vagaries of the time childbirth,disease, mammoths,pestilence, cancer, disease is surely a truism. There hasn't been an evolutionary leap in our bodies not wearing out.

The thing I take from this, is that many now are trying to replicate the ancient way of eating in order to improve health, and there is a large negative voice saying that those people couldn't have been so healthy since they didn't live long. This article goes to suggest that the attempt to replicate the ancient diet, albeit in modern form, is not as ridiculous as some make out.

It isn't semantics because if you are an adult then infant mortality doesn't apply.

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