It's because election day is a weekday and the rest of us have to keep up with the grind. It's entirely because they don't have jobs

It's been this way for 100+ years (probably much longer) and people found a way to vote. It's easier than ever in most places today, with early voting, mail-in voting, whatever other options are available.

In some states it’s easier now; in some it’s much harder.

https://www.brennancenter.org/our-work/analysis-opinion/chao...

Early voting exists in many states. Even in these states you’ll find that younger folks hardly vote.