I think it's a tricky argument. Where I'm from, by the time we were 13-14, we were expected to be responsible for our behavior, actions, and morality, etc. Yes, we were living at home, and weren't working, but it was expected that we are responsible for our actions. Being a "teen" wasn't a thought at the time. You weren't allowed to think it was ok to mess up your life or anyone else's just because you're a teen. By the time you were 16-17, we were considered adults. 18 just confirmed it. But long before you turn 18, you were expected to conduct yourself as an adult. You weren't allowed to excuse or justify any form of supposedly typical teen behavior because you were still "young." We weren't considered or treated as young.
Maybe it was the time and era = 1980s-1990s. When I think back, I knew 15-17 year old women who were far more mature than a 25 year old "adult" in today's world. I think it's because our society trained us to think of ourselves as not young or as teens, but as growing adults. Personal accountability was taught from childhood. You were disciplined if you were believed otherwise. You weren't given excuses like those given to youth today to do whatever you want because you were young. But it doesn't mean, it was the best or a perfect system. This was just the norm for our culture/society.
Much of youth today is too often defined by irresponsibility while someone else, supposedly an "adult" takes the blame. I see people in college everyday who at 19-mid 20s are like kids. They have been taught that someone else should manage their behavior for them, someone else set boundaries for them not to cross. They can't do it themselves. They are like kids needing someone to constantly draw lines in the sand. They didn't have a foundation of learned responsibility. It's as if they were trained to be forever teens. They expected to be treated as kids/teens even in their adulthood.
So, cultural differences matter. Also the society I'm coming from was more authoritarian and collectivist, so there was a firm belief doing what was expected, discipline, and submitting to social expectations for behavior, conduct. There were not as many societyal freedoms as those provided in the US. Social responsibility was considered more important than personal freedoms.
