My point is that a lot of (and maybe most) 90 year olds are not really capable of moving. Moves are a pretty big pain in the ass in your 20s and 30s, but doing the process of finding a new apartment and physically moving are much harder at that age. And then you move to somewhere cheaper because the whole point is you can't afford the city anymore, but now you need to find all new doctors (many 90 year olds have multiple doctors they see regularly), figure out how to see family (perhaps you remained in your old place because your family lived nearby), get to the grocery store (you're 90... you likely can't drive). It's not practical.