I Believe Age Doesnt Define Maturity

I disagree. Maturity means dealing whatever comes up in an appropriate way. Just having an experience, doesn't mean you handled it well, or that you might be able to deal with the same experience better, the second time.

wisdom comes from experience. maturity is something else - it’s knowing what’s right and what really matters and what doesn’t, being ok with it and living by it. it’s knowing and accepting you can’t have what you want all the time and not being bitter over it. it’s accepting that life happens and it doesn’t always go in your favour.

Well, it can mean many things, I've talked to plenty of adults that are definitely not mature, and quite a few kids my age that act really mature for their age

Certainly depends on the individual's self discipline