Slackers?
Here is a blog post that follows up on an earlier mini-review of the book Guyland, which deals with delayed adolescence among young men
This post links to several articles about the same topic – more people in their 20s (not just men) moving in with their parents or delaying their progress toward what used to be seen as markers of adulthood – marriage, children, steady job, etc.
Possibly an important cultural trend to keep in mind when marketing to young adults.