Another possible explanation is that young workers are overwhelmed with household money problems and job insecurity. If you're struggling to pay your rent, you might decide that you don't have time to spend on politics. To be a reasonable candidate for president requires you to have acted in a series of lower roles, like local school committee or city council member, then as a state representative. Those are basically volunteer positions that require a lot of time commitment.

Many boomers are retired, sitting on 401k hoards, and eager to "give back to the community" by running for office. Or have built up financial security as politicians in the past and don't know how to do anything else.