For sure but I gotta ask, even if the young did vote who is there to vote for? The bipartisan system here is rigged IMO. Even if you vote for a less popular candidate they're usually still beholden to the party.
My understanding is that career politicians' take on the youth vote is: "If the stars happen to align, and you play it right, the youth vote can win you an election. But usually not - so you should mostly let your opponent waste his time chasing the youth vote."
A few times, when things looked murkier, I've just contacted the local (city or county) party organization, and quickly gotten answers.
If that didn't work, I'd probably try contacting the League of Women Voters, County Clerk's office, or similar [non-]governmental groups that work at keeping track of such things. And some web searches, looking for primary candidates with on-line campaign info.