This seems to be a purely US phenomenon? It seems a great idea to scale retirement communities to the point of having their own hospitals and theaters etc. but

This seems to be a purely US phenomenon? It seems a great idea to scale retirement communities to the point of having their own hospitals and theaters etc. but I don't see it happening here. Just smaller groups of houses with maybe a few carers and an on-call nurse. And our aged care system is officially horrific and an election issue.