This a big worry. I thought Trump was for old angry people shaking their fist at sky. The ones with dementia. Why are young into him?
In both areas, the young people I know that are Republicans, and pay any attention to politics, seem to mostly be attracted to his energy and wild promises/claims. They also tend to laugh at the things that I expect many here are concerned by.
Big claim, but as a consequence you're seeing his support tail off substantially in younger voters as the rubber (his campaign claims) meets the road (actual governing, policy, and results). https://www.chip50.org/blog/whose-approval-disapproval-of-tr...
His rhetoric on the campaign trail was attractive to people who didn't think past first order effects ('Yeah! Fewer migrants! They took our jobs!'), but the net effects are becoming evident to those same people, even if they don't understand why.
* I'm explicitly differentiating "Trump voters" from Republicans-who-voted-for-Trump (aka the temporarily endangered mainstream Republicans)
At that point, there's going to be a huge shakeup in the Republican Party, and the American right wing more generally, because from all indications, he's the only thing holding that coalition together, and they do not have a successor who could do anything like the same.
TL:DR Brainrot