I agree with you to a point. The "youth vote" may not count in any single election, but youth voters tend to become committed lifetime voters with strong opinions that can influence friends. 1,000 youth votes in this election may become several times as many in four or eight years.
I don't think it's just apathy that keeps youth voters away. There's a lot of hype surrounding the election itself, but it's easy to let the registration deadline slip by. Experienced voters are more likely to remember where & how to register & more likely to have lived in one place for long enough to have all paraphernelia you need to register. Youth voters move around a lot more, so it's harder for them to know where & how to register & to have the necessary proof of residence, etc.
I'm Canadian, so the obstacle course you need to follow in the USA to register is kind of mind-boggling. Here the government keeps active voter registration records (we call it "enumeration") that are shared among federal, provincial & municipal elections, & all parties have aggressive get-out-the-vote organizations. If somehow you get missed, you can register at your polling station with picture ID & a recent utility bill showing your address. (They will catch you if you vote twice.) Of course, our Parliamentary system of government doesn't have fixed election dates & election cycles tend to last six weeks or less, so our system needs to be more flexible.