I think it’s difficult to say what “proper” socialization is since all people lead different lives, but at the very least it is one that helps a person be comfortable with their peer group, with those (much) older than themselves, and with those younger than themselves. It’s an organic socialization, one much more open-ended than the kind seen in schools.
As an additional note to that, I think that the reliance on homes for the elderly has similarly dangerous implications. Young people have a harder time interacting with and seeing the pasts of the communities they are in, removing the temporal connection. John Taylor Gatto has some good stuff on that.