Living at home over the age of 25 and not contributing financially, and/or blowing your money on bullshyt, should be called out and frowned upon. Ultimately though, if the parent(s) are okay with that set up, who are we to judge? Not my thing, I think it builds irresponsibility in your grown ass children, but people do what works in their families. Some parents will allow children to stay with no financial obligation because they need the companionship...
Everyone's situation is different...
I do feel strongly in something I've mentioned before though, that black families should get more on board with allowing their kids to stay at home as adults instead of rushing them out. We don't even fully develop as adults until 25 or 26, and too many of us aren't actually ready to live alone when we actually start doing so. shyt creates a bunch of other issues...
Allow your kids to stay home as long as they need, while also reinforcing responsibility in the form of household tasks or paying a bill. You can do all of this and help build most people to a point of comfortability and financial security to go out on their own. Also, life happens, we should be willing to take our kids back in if they need us (divorce, incarceration, lost job, etc are all reasons adults move back home). It's okay; I'm not saying the child who just can't get right at 30+ should still be allowed to stay at home unless there's a mental issue...
But shyt happens and many black parents forget that no matter how "grown" your kids are, they are still YOUR KIDS. There are still times they'll need you in their lives at 19, or 24, or 30, or 37, or whatever. And if you can afford to bring them in you should do so, as I get older I realize how many of us ran out befire we were ready and bear the signs of it to this day...