If the 86-year-old Hoover voted in 1960 for Nixon, who was 46, then we achieved the 40-year difference already.

Nixon was 47 by Election day on 1960 though (born January 1913). The Harris/Carter age gap will be 597 days longer than Nixon/Hoover

“Hoover lived for thirty-two years after his presidency and continued to be a voice in politics. He delivered a speech at the 1960 Republican National Convention when Nixon was named the Republican nominee for president.” www.nixonfoundation.org/2022/08/pres...