Trump actually did better than expected with the youth vote in certain key states according to CNN exit polls.
Wisconsin: he won 18-24 year olds 45-43 points.
Minnesota: he won 18-24 year olds 48-43 (the only other age group that voted for Trump was the 50-64 demographic).
Pennsylvania: he lost 18-24 year olds 50-45, but this was noticeably better than how he performed among 25-29 year olds (lost 53-40) and 30-39 year olds (lost 54-40).
Given that people generally become more conservative and not less as they grow up I'd say he's in a pretty good spot in the rust belt.
All he has to do in 2020 is hold Florida and flip Minnesota and he can afford to lose NC, Arizona, and Georgia.
People stop changing their political beliefs sometime in their late twenties to early thirties. Most of the change occurs between the ages of 16 and 25. Which way it changes depends on the social/economic environment and is not constant.
It's a myth that people get more conservative or liberal as they age...the current events around them have less and less impact on their beliefs as they age and that's about all that happens.
