Maturity is the realization you can say "NO" without apology, and "YES" without guilt !
Yeah... I don't explain myself much now.
I used to spend countless words explaining, and then I stopped and just left it at Nope. It felt so freeing!!
"Yes without guilt". I'm 60, life is really short, I am going to eat dessert first.
You are right. Some perks should come from having to use glasses, experiencing the occasional joint pain, moving a bit slower, and having less hair.
I think maturity is the ability to disagree without hurling insults, avoiding the question or storming off, among other things.