Our lifespans are 60-70 years and have been even in those times.

Child mortality just lowered the average to around 30. A lot of babies died, but if you managed to get to your teens, it wouldn’t be unreasonable by any standard to assume you’ll get to 60-70.

Our “three score and ten”.

“There’s no teeth left”?

I mean unless they smoked a lot of crack or meth back then, idk where the teeth would’ve gone. Sure they had worse healthcare but probably also a healthier diet for their teeth.