The first part gets into the question, "why are twentysomethings not acting like 'grown-ups'?" His answers are worth considering.
As to the second part, for those who were asking that famous question, "But what about the men?", this is a pretty good answer. He doesn't ignore women by any means, but there is a really solid treatment of masculinity here.
I'm not sure I buy his attempt to link these two things as closely as he does; I think his fieldwork among the sports teams, fraternities, and sororities of US colleges may have slanted his views a bit there. Still, I think it's a video well worth the considerable time investment.
[Note: there's about a 5-minute intro before Michael comes on.]