It’s not exclusive to the USA though, and in countries with higher turnouts, more younger people vote as well.
Why Don’t Young People Vote, and What Can Be Done About It?
They don’t outvote their elders anywhere in the world. But our analysis of global voter data found that in places where more older people vote, more younger people vote, too
Purely anecdotal, but when I was younger, I really didn’t give a shit about politics, all I was interested in was getting mashed at raves every weekend