Good observation; and there’s also no evidence of lead poisoning in the relatively scarce Roman remains.
I’m thinking it had to have had something to do with alcohol ;)
Years ago I acquired a book from the 1800s. It had lists of famous Greeks and Romans, including life span. Eliminating soldiers who might have died of battle or accumulated injuries, I was surprised to see famous Greeks lived about 20 years longer. Most of the Romans died in their 50s while Greeks lived into their 70s. I suspect the Greeks ate the Mediterranian diet while Romans ate the Urban diet, and lived with the Urban germs.