So I just confused myself all over again...
You must be 18 for adult membership -- so the question is can I bowl in adult WITH youth membership WITHOUT the rule 400 form(so I can get into pots).
No, you can't. To bowl in adult leagues, you have to have an adult membership. You would have to forfeit your youth membership to bowl in that adult league.
I would actually say that if you've done all you wanted to in youth bowling, Collegiates is where you should head next, because you may find that while you are the best in your area, you certainly won't be when you're bowling teams or singles in collegiate tournaments. You may find you have a lot to unlearn and relearn because you've kept your view rather narrow.
But we see that the want for money is driving this, so if you want to bowl adults just for the money, wait the last year and go adult.
BL.