When did you “grow up”?
“Growing up” is one of those societal constructs advertised to us from an early age. We saw it in the cartoons we watched, toys we played with, and the adult humans around us — all “grown up” themselves.
But growing up is a very abstract concept. If I look at my own life, I can point to some aspect and say I grew up at some point in time. I could look at another and say I'm still growing up there. (Am I doing it right?) But for most, this idea is grounded in the expectations others set upon you.
In the US, the doctor recommends you get a job, buy a house, find a spouse, have some kids, and retire. Our culture reinforces this through our TV shows, our ads, our news, our magazines. And each accomplishment along the way continues this reinforcement with a celebration. Bought your first house? Congratulations! Get engaged? Great! Each milestone makes you feel good, and is one step closer to realizing your full “grown up” self.
Of course, none of this inherently bad. Self-sustainability is always good, as in getting a paying job. But once you can cover your basic needs (food, water, shelter), I think it's safe to declare you've “grown up.” Because part of being grown up means getting to decide what being grown up means. Want a family? Go make it happen! Rather not? Cool! You're a grown up! Do what you want! The important thing about growing up isn't “growing up,” but forming your own expectations for yourself so you can personally gauge how well you're doing in life.