Half A Billion Fewer Animals Are Being Killed Every Year Since 2007 As People Eat Less Meat

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DonFerrari said:

Prehistorical also had a very long aged live.

There are examples of largely plant-based populations in pre-history where "old age" was living into your 70s so, yes, that was true for some of them.  Less plant-based typically meant shorter lives, and worse weather tended to mean shorter lives, so plant-based populations near the equator typically lived the longest, and the inuit typically lived the shortest lives in pre-history.