THERE’S no theme in his campaign more incessantly trumpeted than a generational one. Declaiming that Hillary Clinton, 68, is yesterday, he presents himself as tomorrow, an ambassador for young voters who’ll presumably bring more of them, too, to the Republican camp.

But in a Washington Post/ABC News poll in late November, his support was more than twice as strong among Republican voters 65 and older as among those under 50.

And he’s at sharp odds with millennials on a range of issues. Most of them favor same-sex marriage; he doesn’t. Most are wary of government surveillance; he’s one of its fiercest proponents. Unlike him, they want marijuana legalized. Unlike him, they want decisive government action against climate change.

And they’re not swayed by unwrinkled skin and a relatively full head of dark hair. Just ask wizened, white-tufted Bernie Sanders, 74, whose campaign is the one most clearly buoyed by young voters.