Growing up

Yesterday was June 13 and then I realized that there are only 4 month until my birthday. Tic tac! 4 more month of the 20 something and then ... Does that make me feel more mature? Nope. I actually feel the same, as in my perception is that I don't feel or see myself older like the age from the papers will soon scream. OK, I don't feel like having a certain age, but growing up makes me mature? I'll answer again discrediting any marketing messages what so ever: "No". I've seen people much older than me not being mature at all or the opposite, younger ones being wiser. That concerning the age versus maturity. Then is the self perception that according to those I've been talking to changes only when we look (briefly) in a mirror. We might be 50 and still feel in our souls as a 20 something person (mental age), even though we might also feel after that age the signs of a mature body (a little pain here and there).
How do you weight maturity? If you're not capable of making a self analysis is the opinion of others good?
I find myself searching an answer to that question. As I often do, I went to a dictionary.

Maturity is a psychological term used to indicate how a person responds to the circumstances or environment in an appropriate manner. (source Wikipedia)


OK the mature emotionally versus mature physically talk. I find it difficult, like many of you might as well, to give up on the child inside just to embrace the "appropriate manner of doing things" side. But being a mature person means just giving up to something or can it be also a problem of finding an equilibrium between responsibility, making the right thing and not loosing the fun side of life?
I'd like to embrace the middle way. Even though my baby face doesn't help me to look more mature in the eyes of others I'd try making some changes in the ac and react area as hard as it might seem at the first look. That's one of the main goals from now on.
How do you feel about this subject?