I don't think KK is talking about averages that have been brought down by infant mortality. He's saying explicitly that among hunter-gatherers, lifespans were

I don't think KK is talking about averages that have been brought down by infant mortality. He's saying explicitly that among hunter-gatherers, lifespans were short. Which I believe from what I've read about them. It's also false that people who made it to maturity in preindustrial times lived as long as people do today. It was unusual to see 70.