I think this was from late October and his numbers have only shrunk a bit since, but here's Biden's general job approval rating by age from a NYT-Siena poll:

Net approval rating being consistently higher the older you go is fucking wild for a Dem president lmfao, it was the complete opposite for Obama

His boomer supporters being nearly 5x more enthusiastic about him than his zoomer/younger millennial supporters is also very telling

Going back to 2020, Gen Z is the only generation that voted for either candidate with a genuinely large majority. No other age cohort swung more than +10% for one candidate except gen z, which voted Biden's ass +34% even with the lowest turnout. He's fucking doomed if even a fraction of those past voters are done with the "lesser evil" bullshit, and they are