edit: In all honesty, I've always felt like I was way older than I am. I feel like a man in his 30s in nearly all aspects of my life (except intelligence and worldly knowledge, I'm mainly referring to demeanor and social interactions). I'm 21 btw. I've always felt like 10 years older.
Every minute I spend reading these forums, I feel more and more like an adult.
I pride myself on being old at heart. Maturity is a beautiful thing.
I am 44 and I can tell you - there will always be a part of you that doesn't grow up.