Pre-industrial societies have much higher infant mortality but for those who live to adulthood their lifespans are not that much shorter than ours. If you survi

Pre-industrial societies have much higher infant mortality but for those who live to adulthood their lifespans are not that much shorter than ours. If you survived early childhood, your odds of getting into your 60s would be pretty good, and plenty of people made it into their 70s. And many whales die of what we would consider old age - typically they get weaker and weaker as they grow old until they reach a point where they are unable to consistently swim to the surface for air, and thus drown. Pretty much what you'd expect if you flooded a nursing home.