Can you expound on what you would propose. My experience is that clubs or meetups often don't forge all that close relationships. Another example I could think of which is more positive is co-ops where people lived in a door room type experience with community rules and chore responsibilities (cooking, cleaning, maintenance). But I think many adult American's would think of a co-op as to close to a commune.
Coop living for the elderly I think would be a fairly good start, I'm German and we have some of those communities in the south, it's usually like a small village where older residents take care of each other with the assistance of some company who provides caregivers, but people enjoy much greater autonomy than they do in their homes. It's not only cheaper, but also more dignified and people seem to be happier.
For younger people I think coops are a great thing too. In the US implementing policies that discourages single family housing and promotes closer connection between workspace and living space I think would help. If you live and work in walking distance of your chess club going there is more likely compared to someone living in the suburbs.
For communities there's also time banking which has gotten a little attention in recent years. Essentially paying people in a special currency for reciprocal help in their local communities that can only be exchanged locally, and everyone earns the same based on how long they work. Basically an egalitarian approach to fill in the gap where markets are too anonymous to provide meaning or where they don't exist at all.
And then I think government and companies should do much more to promote education for middle aged and older people. And not just online learning, but physical interaction. In my experience educational institutions are some of the best places to make new social connections.
Can you expound on what you would propose. My experience is that clubs or meetups often don't forge all that close relationships. Another example I could think of which is more positive is co-ops where people lived in a door room type experience with community rules and chore responsibilities (cooking, cleaning, maintenance). But I think many adult American's would think of a co-op as to close to a commune.