I agree that there's a large partisan and ideological gap between the young and old, but people have been predicting the "aging in" of a new, more progressive electorate for about as long as I can remember. It never seems to actually happen.
Shifting politics takes time, a glacial pace. Lots of progress so far (LGBTQ+ rights, marijuana legalization state by state, minimum wage increases, restoring voting rights to felons), just have to keep applying pressure. Lots of work left to be done. See you on the campaign trail.