"The likeliest explanation for this is that while younger Republican candidates may have a greater cultural connection to young voters, the ideological gulf is vast. Even if they are only a decade older than Millennials, politicians like Cruz, Rubio, and Walker hail from a different political generation both because they came of age at a time of relative prosperity and because they were shaped by Reagan, whom Millennials don’t remember. In fact, the militantly anti-government vision espoused by ultra-Reaganites like Cruz, Rubio, and Walker isn’t even that popular among Millennial Republicans. As a July Pew survey notes, Republicans under 30 are more hostile to the Tea Party than any other Republican age group. By double digits, they’re also more likely than other Republicans to support increasing the minimum wage.
"Republicans may modestly increase their standing among young voters by becoming more tolerant on cultural issues and less hawkish on foreign policy, but it’s unlikely they will become truly competitive unless they follow the counsel of conservative commentators Ross Douthat and Reihan Salam and 'adapt to a new reality—namely, that today, Americans are increasingly worried about their economic security.'"
Peter Beinart at The Daily Beast predicts that most young voters will remain left wing as they age.
David Frum reacts to Beinart's article.