I'm not sure how old you are, but shortly after Obama took office in 2009 there was quite a bit of reporting claiming that the Bush administration had been so disastrous and young people had been so thoroughly poisoned by Republican policies, that it would likely be a generation before the Republicans had the chance to win the presidency again. Remember, Bush left office in the depths of the Great Recession. Instead, it took less than 8 years for us to get MAGA.
In 2024 Trump got some of the youth vote, still not a majority. Trump never won Gen X (or at least Millennial) and below.
So the prediction sounds right? The Republicans have burnt the youth vote pretty badly and have never really recovered.