Not always. Kids can’t get jobs and so can’t rent apartments. My nephew lives alone but I suspect his wealthy dad is paying the bills. I think a lot of this is economically-driven while, yes, some are pajama kids. Mostly the ones out protesting.
Think about it ... We basically have a situation where adult children can't afford to buy the homes from their own parents. That's not a symptom of a poor economy, but an overinflated real estate market.
I suspect a lot of younger people are wising up to the fact that owning a home may not be the best thing for everyone. In an economy where a person's flexibility to relocate may be critical to their future, an overpriced home can be an enormous anchor.