My counter to OG's counter is that I'm going to have, in practice, no more control over my own destiny if the UK is out of the EU (being 1 person in ~50 million) than if we were to remain in the EU (1 vote out of ~500 million). It's an order of magnitude better, perhaps, but still practically a non-influence.
Once again, though, we've seen a couple of people come out with the "who cares about young people's opinions, they're all brainwashed anyway" crap. Whatever damage staying in or leaving the EU does to our young people, the wholesale rejection of that generation's views, opinions, and to an extent even their identity (if someone is brainwashed then they are not their own person, after all) is far more damaging. Young people deserve better than to be dismissed as inconsequential.
I don't believe this argument should be used to try and sway anything, even if it were capable of that. As I said before, if you care for young voters then presumably you'll try and do what is best for them, which just leads you to the same conclusion as before. And I wouldn't support an upper age limit for voting either. The outcome of the vote will have impacts for a long time, particularly if it's a vote to leave the EU (there is, in my lifetime at least, surely no going back). But it will also have impacts in a short enough term for everyone to care.