It reminds me of 2000. I’m actually just old enough (by a couple months) to have voted in 2000 and I’ll freely admit voting Nader. It reminds me a bit of 2004 as well, but that time there was no way for the Democrats to blame Nader. In both elections, most of the people I knew in high school/college didn’t really like either candidate, didn’t see that it would make much of a difference who won (though this was definitely a stronger feeling in 2000), and often didn’t vote.
Between the historic poor turnout of the youth vote, no matter the election or generation, and a general dislike of both major party candidates, I can easily see the youth vote being quite low. My guess is that more will get out to vote Clinton or Trump than Stein or Johnson, and that Clinton will win the group overall, but that she’ll be in more trouble than she had to be. More importantly, she won’t get the numbers needed to help offset the elderly voting for Trump in various swing states.