That would be nice to know for sure!
A couple of thoughts come to me.
I think way too many are either unable, too lazy or just don't care enough to keep up with current events.
Your last bullet point rings a bell. The average voter turnout percentage since 1960 is 55%. 2020 was an exceptionally high voter turnout of 62.8%. Which was close to the norm between 1952-1968. Voter turnout of above 60% in all 5 of those presidential elections except 1956 when 59.3% turned out. Since then we had two very low voter turnouts, 49.0% in 1996 and 50.3% in 1988.
5 of the last 6 presidential election have had below the average of 55% voter turnout with 2020 being the exception. Perhaps people just don’t care. My son may be the classic example. He’s 55 and never voted. He says Washington going to do what Washington wants to do regardless of what the people want. We’re screwed no matter who wins or who’s president.