Based on this September 28 analysis by the Pew Research Center, the incredible 2008 engagement among young people — under 30 — was an anomaly. 

Young voters are significantly less engaged in this year’s election than at a comparable point in 2008 and now lag far behind older voters in interest in the campaign and intention to vote. The share of voters younger than 30 who are following campaign news very closely is roughly half what it was at this point four years ago (18%, down from 35%). Just 63% of young registered voters say they definitely plan to vote this year, down from 72% four years ago.