> We only lived to our 30s just a few hundred years ago. That's not true. Life expectancy used to be strongly bimodal, with a lot of people dying as children,

> We only lived to our 30s just a few hundred years ago. That's not true. Life expectancy used to be strongly bimodal, with a lot of people dying as children, and the rest living out a more or less modern lifespan (unless they caught some disease). Sure, average life expectancy at birth was around 30, but average life expectancy at age 18 was way higher.