Not close from my parents home is a small farm collective of mostly ex hippies who have been living there communally for decades with people well into their 80s now. It was so successful that the city, taking that as inspiration, ran trials of creating more autonomous senior communities that are largely self supervised, including even people with dementia.

From what I heard it works extremely well, not the least because it's more dignified and keeps people engaged, active, and self reliant. The modern notion of the drooling, dependent nursing home patient is a product of our (artificially!) atomized system.