The generational gap is a red herring, at least politically. It’s largely an artifact of racial differences by age cohort in the US:
Younger generations are less white than older generations. That’s why younger generations vote left and older generations vote right. White millennials vote like their grandparents do. Not like their grandparents did when they were younger, but like their grandparents do now. A similar pattern holds among blacks and Hispanics, though younger blacks really do appear to be less beholden to Democrat-by-default than their elders are.
Parenthetically, I suspect a broken dollar will strain these generational political affinities. When things are tight and the kids are not all right, does one-fourth of the entire federal budget still go to Social Security?