Our Italian neighbour was a building Forman on large building sites.It's not the concrete that degrades as much as the reinforcement that holds it all together. The Egyptions used concrete but it was da Vincie who invented reinforced concrete. That was the game changer and the principle has been in development ever since. Check out the link below re concrete cancer, that is the limiting factor with concrete. In these days of careful scrutiny and engineer inspections the concrete structures generally last longer than ever, but I would opine that it's land availability and prices that limit the service life of a concrete building.
https://partridge.com.au/concrete-cancer-what-is-it-and-what-does-it-mean/
He told me in Italy they had to put all reinforcement steel through a cement slurry making sure it was all coated.
This is not practicing here and he said it makes concrete cancer more likely and starting sooner
When he built his house he sure didn’t just chuck rusty steel in