I think that’s another BIG factor.
I grew up in the sub-rural midwest: we were a transitional community where agriculture and dairy farming were butted up against newer “bedroom” commuter communities that were the beginnings of suburbia. I grew up with all these 80-some-year-old German, Polish, and Irish farmers who would sit in the tavern at 3pm and have their lagers, herring, pickled eggs, and knockwurst while they talked about “the old country”. That kind of thing. We’d always marvel at these old guys who’d eat damn-near anything they wanted–typically tons of bacon, eggs, stuff simmered or poached in fat, butter, tallow or lard, and just live to Methuselah years, often outliving their wives (aka “Witwerbauer” or “Widower-Farmer”). How could they eat like that and live on?
I now strongly suspect that it was a combination of a whole-food, mostly keto diet, combined with ass-breaking work.
And I fault them not for their pilsner and pinochle afternoon reward… 