Donald Trump turned 80 on Sunday. When Joe Biden was president, 80 was too old for the job (even if people who mocked Ronald Reagan, Bob Dole, and John McCain for being over 70 tried to tell you otherwise). As I observed then: “Britain, by contrast, has had three prime ministers serve past age 80, all of them long-tenured giants of the office: Lord Palmerston died in office at 84 in 1865, William Gladstone served until he was 84 in 1894, and Winston Churchill stepped down at 80 in 1955, after struggling through his final two years in office following a........

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