If they are 50 years old, they are already, it may be hidden but the concrete cancer has most definitely kicked in at that point. Don't worry it's not going to have dramatic structural impact for the next 50 years, but at some point the bill will start coming to try and keep the building from falling apart. Until it's not economical to do so…

> concrete cancer

You mean decay ?

I mean this: https://fr.wikipedia.org/wiki/Carbonatation_du_b%C3%A9ton#/m...

So decay

Call that the way you please, it's also called “concrete cancer”, and I find the expression much more apt.

It isnt because we are not talking about living things.