I think this thread proves that just because you're 23 doesn't mean that your mature. It also shows that just because you're 36 it doesn't mean that you any more mature...
Age does mean something, but in an industry where airline pilots are being hired at ages less than 20, it doesn't necessarily mean that older means more experience.
Personally, I am still what many people would consider young at 29... That said I think you'd be hardpressed to find somebody that knows me to call me inexperienced... Simply put, you can't judge a person by his/her age, looks, personality.
Everybody can have (or lack) age, maturity, experience, and all it often takes is a few posts to determine.