As I stated you can't “make” anyone grow up.
Anyone can live their entire lives without growing up if they so choose. And with the government or a family enabling them, they can live quite comfortably.
The fact of the matter is:
If girls refused to even talk to a guy who didn’t have a job, a car and his own place.
The age of kids reaching adulthood would be at all time low, and employment of the youth would be at an all time high.