I was told to “grow-up” in my teens and by the time I was 17, I was enlisted in the Army Guard, and commissioned when I was 20.
Extended childhood is the failure of parenting. Parents who are still trying to “grow-up”.
And by-the-way...now that I will be turning 72 in a couple of weeks or so, I have a son on his own, a Grandson on the way, and my wife and I are enjoying our “childhood” with our hobbies and interests. Can you say “Old Arn”?