From the Center for Information and Research On Civic Learning and Engagement: 

Our final analysis of statewide youth voter turnout by region examines the electoral participation in young people in nine Eastern and Northeastern states. Key takeaways from this group of states include:

• New Jersey had the highest youth voter turnout in the nation: 67%. 
• Despite being the only major swing state in the region, Pennsylvania had a similar youth voter turnout rate (54%) to other states in the East and Northeast. Perhaps relatedly, it’s the only state in the region (for which we have turnout data) without either pre-registration or automatic voter registration.
• Vermont and New Jersey which implemented full vote by mail programs in which they automatically sent ballots to every voter, saw the biggest increases in youth voter turnout compared to 2016: rising by 12 and 22 percentage points, respectively.