That's why financially dependent persons don't vote or drive.
Come to Italy, you'll find people aged 35 who live with their parents and are financially dependent even with a Ph.D. and an academic researcher career.
You're so biased.
I'm aware of both instances. I'd argue that the European approach is better. However, if someone is paying your bills, they get to set the rules for continued financial support.
You're missing the main point: the rules for continued financial support don't dictate how adult a person is: how conscentious he can be, the hard decisions he can make, how he manages responsabilities with the people he cares about.
Maybe the adult lives with the parents because it's the most adult thing to do and will will leave if these conditions are no longer met.
And yet, you're judging those persons as "non-adult" just because of a prejudice.
I repeat myself: so much bias.