Voting takes focus, skill, and follow-through. Stability helps. Not youthful traits.
Here's my take.
Voting was just so mainstream, and turning out Bush was the establishment thing to do.
That doesn't exactly sound like something youthful Americans do - sure, they jump on bandwagons, but man, they reject the hard sell and Bush is counter-culture at this point. Ollie North was the hero for our generation when everyone else was hating his gutts.
It still applies.