I have to admit to having no strong opinion on either the age-limit for the Jr. trophy or the schedule of the GC/NA regatta. At some level they seem independent, only overlapping in the general sense when we consider how to increase participation in the class (among all sailors). I'm also in Ken's "old fart" age category, with an employer who is just as likely to let me take a long-weekend vacation on a week's notice, or a weeks -vacation on long-notice - so I really don't have a horse in this race at all personally.
With the above caveat, I'll say that IMO the difference in age between 18 and 21 isn't that big these days. It's the difference between graduating from high-school and just about to graduate from college. For most kids in iceboating there's not a huge change in independent status between the two ages.
Another thing to look at is other classes' definition of "junior". For example, in the Laser class, it's 20 (
http://www.ussailing.org/championships/youth/youthchamp/2007/Amended_06-12-07_YouthsNOR.pdf).
So, it seems to me that changing the definition of "Junior" to 21 isn't a big deal. If it will encourage more "kids" to come to the "big" regattas, then I'm all for it. Given the small number of "under 30" people sailing, I can't see how the change would be much a discouragement in any case.
Cheers,
Geoff S.
US-5156