Why does America want to be ruled by old men?

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It is now looking as though the next POTUS is going to be a septuagenarian, whoever wins the election in November. The Democrat field is being whittled down to Joe Biden, who will be 77 on polling day, Bernie Sanders (79) or possibly Michael Bloomberg (78). You will have to add four years to those ages to the position they will be in when seeking re-election for their second term, should they live that long. The alternative is to vote for the comparatively youthful Donald Trump, who is a mere 74 and will only be 78 when he ends his second term. What is going on? Before the Trump era, only two previous American presidents even turned 70 when in office, namely Ronald Reagan and Dwight Eisenhower. We used to think of Reagan as a doddering old fool when he left office at the age of 77, after two terms, but that is the age which all of the Democrat candidates will have reached before they even start, should they win! Does this preference for geriatric presidential candidates have something to do with the fact that the people who actually vote in American elections are much more likely to be old than young? In 2016, 71% of voters aged 65+ cast a ballot, whereas only 46% of those aged 18 to 29 did so. Have the younger generations simply lost faith in the political system and left the field wide open for the greyheads to play their inconsequential games?