average lifespan of the elite roman class?

[Ludens]

Even more so when diet was not balanced. Unlike today food back then change with the season, and even the kings of an island would be eating mostly fish (which is actually a good thing), while many elites gorged themselves on game and meat and die from it (indirectly).

While I agree with most of what you say, I have to point out that the diet of medieval peasants was in some ways better than what we have today. Yes, food quality was worse and availability uncertain, but the food was rich in fibers and nutrients. I assume the same applies for farmers of other eras. Nowadays we eat mostly comfort food that contains much energy and flavour, but little else. It's true, though, that elites would have overindulged in the time's equivalent of comfort food, but food quality and availability would have been less of an issue for them.