DMC?? That sweet angel of a young gentleman?? I believe that he refers to a maturity of the mind and soul, while you mentioned physical aging. Not the other way around.
Irregardless. The definition of maturity is, "The state or quality of being fully grown or developed."
He was calling you old!
By your definition a 21 year old is then old....
I don't think so.
After all, you're older than 21, and I'm not considering you mature.
