I'm going by voter turnout based on percentage of voter age population https://en.m.wikipedia.org/wiki/Voter_turnout_in_the_United_States_presidential_elections which peaked in 1960 for the period from the Great Depression to the present. So all the things you talk about are interesting in another discussion but irrelevant to the voter turnout vs voter age population discussion.

A higher percentage of those eligible to vote (including minorities) did so in the antiquated 1960s than the accommodating 2000s.