I've fought long and hard about this, but they really don't want to budge. But, this year on the Resorts mailer, the only thing it said was that minors were not permitted to register, they did not say anything about being 21 on it.
I think it's a stupid rule, but I'm under 21 so that makes sense. Don't try to plead your case, it just wont work (right Bree?). Just work around it, it has and will continue to be done.