If im not mistaken, sanders was out performing Obama with the youths. Also, I remember reading that bernies young votes outnumbered trump and Clintons combined.
All right. Let's do a math analogy to explain why this doesn't mean shit.
Let's say 100 people voted for Trump, Sanders, and Clinton.
What you basically had was 88 of them were over 25. 12 of them were under 25.
If 9 of those 12 voted for Sanders, that means more young voters voted for Sanders than Clinton and Trump combined.
But only 12 young people showed up, see. Compared to 88 older voters.
And so those 9 votes Sanders got don't mean shit when 90 percent of the older people voted for Clinton and Trump.
The young voters just didn't show up. Like always.