I just saw 127 Hours with my son yesterday (Pfew-Intense!) about Aron Ralston, who cut off his arm after being trapped for days in a climbing accident.

By many standards discussed in this thread, society may not have considered him "grown up"; he left an engineering job with Intel to work in a hiking shop and do more rock climbing, he seemed "to live to climb", etc.

But, while I'm certain that the movie takes license in its rendition of the event, the true test of maturity is that he SURVIVED a hopeless ordeal through SKILL, DETERMINATION, PERSEVERANCE, and perhaps a little bit of luck.

In addition, according to quotes of this article, he turned "lemons into lemonade" by continuing a prolific passion for climbing with continued success.

OK, he married and had a kid later in life and "played" a lot for 35 years, but in my opinion, while he was not socially perfect, he sure proved he was grown up in a narrow canyon near Moab.