I draw the line at the point when someone has a stable job that allows them to pay rent. I've seen people who basically had "two youths" and they were generally unhappy.
I learned so much about myself and the world and I wouldn’t be in the place I am today without my “second youth”. In a sense I gave myself the college social experience but I had an additional 10 years of wisdom to rely on (don’t follow the dealer to a second location, etc.)
Anyway, one instance:
-Graduated law school, but didn't go through the bar exam.
-Spent seven years working part time and being part of a theatre group.
-Left that in his 30s in favour of entering the workforce for real, moved abroad and had a full time job for 4 years.
-Left that job, moved back to his home country and has been coasting doing part time jobs ever since.
Plenty of people with similar stories - some of them were shaped by the 2008 economic crisis, which made several European countries enter a period of stagnation that continues to this day.