Forcing successful older people with their complex lives in this modern technology era, into traditional living together situations in the same rooms, is not like it was when we were in our twenties. Most of our visions and futures are complex, narrow. Maybe can work like a team for some with that sharing orientation, if much is in common and life goals mesh, but lots of chances it won't.
I do like the urban idea of seniors only villages within large multiunit, fewer fancy feature, less expensive, buildings of all studios that would simply bring seniors together in face to face living. Better to give single seniors more space where they can more gradually get to know others without as much social pressure. Such villages run by residents themselves, could have regular events as a community to help people mix. If some eventually end up married deeply in love, terrific. For others, just being near like others in an era when most families no longer live multi-generationally, will fill an open senior need, providing a wide range of informal solutions.