your bailey: "average lifespan has nearly tripled despite how much worse care we take of ourselves and how fat and weak we are.

that's medical science."

I'd like to keep my comments in that context. There's no evidence for your belief. It's based on faith. The ceiling for gains is low and attributing even half those gains to medicine requires profoundly discounting sanitation / end of child labor / food supply chain improvement / end of male-midwife-murder / outsourcing of dangerous jobs / 100x other things.

A 20 year-old in 1850 was not some superhuman Spartan forged in fire. It included childhood-malnourished, poorly-housed working men and women who wouldn't live the year, the decade - this is obviously reflected in the additional increase in 40 year-old life expectancy. There was still plenty more "selecting" on the table, namely for the geographically unfortunate (urban / migrant) poor.

Puzzled at which "fallacy" acknowledging a lack of any historical signal anywhere for medicine's impact on humanity is; I don't have all the names memorized.