If you have to post in yhe pit that you are more capable than most adults and need reassurance you are mature then you probably arent mature enough, age doesnt matter its how yoi act.
^ see my sig.
If you have to compare yourself to older guitarists and say that you're better than a lot of them, then probably not. I'm 19 now, and I used to think I was hot shit until I got into jazz school.
It worked for Iron Butterfly.