Burney to vote Tory
I'm going to say the polls are completely wrong (again) and the youngsters won't go out and vote. Labour to get below 200 seats.
Young people may vote, but they will do so in concentrations like University towns where it will make no difference. It's entirely possible, in fact, that Labour's vote share could go up on 2015's but they still lose a shedload of seats. That'd give them something to moan about.
The fact that the polling is bloody appalling makes predictions very difficult, but I'd say a majority of anything over 50 is a pretty solid bet.