Though it's better than what used to happen - which was lots of kids, and high infant mortality, plus poverty driving kids to find jobs in cities, where bad living conditions and factory work awaited them. (And in the 20th century company towns around mines and factories.)
People growing up, flying out of the family nest, and finding friends was a normal part of late teenage years. What's new on top of that is more people are trying to do it again in their 20s after higher education, and again after settling down to have kids, and ...
The good news is that we have the social technology of ... affordable safe high density cities, with parks and high-rises (plus the obligatory blackjack and hookers too!) ... where people can be next to their new and old friends at the same time ... oh my!
Also https://asteriskmag.com/issues/08/the-myth-of-the-loneliness...