I don't think previous generations "average" life expectancy means persons died in their "forties", more like many infants died before maturity and that averages out with those who lived on into their eighties and nineties.
I have seen some pretty healthy non-vegan, meat eaters--namely lions, tigers, and bears.
My old man was a cattle rancher who ate all the meat and potatoes he wanted, lived to be 86 years old, never exercised "on purpose". Only remember seeing him run once time in my life, for about 15 seconds (he always wore cowboy boots). He often said he wanted to die "with a piece of meat in my mouth". Funny irony in that wish was, he actually died of a bowel obstruction! (but please don't blame the beef for that demise)
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