[thowaway959125]

To me, this is undoubatedly a huge part of the problem.

I noticed that my depression spiked when I started to become more isolated. I was getting older, long time friends are now scattered about the country/world, difficult to make new ones. Family members are isolated and scattered doing their own thing in their nuclear units. Parents are divoced and fending for themselves too. Finding a romantic partner under these circumstances is difficult ... having no friends can be seen as a "red flag". It snowballs.

I have also thought of the concept of shared housing for adults. I LOVE this idea.

They share the responsibilities much like a multi-generational family would, they just happen to be strangers.