In 2008, when Senator John McCain was the oldest person to seek a first term in the White House, his campaign set out to reassure the public about his health.
Today, President Biden is 81 and his rival, Donald J. Trump, is 77, and many voters believe both men are too old for another term.
Their doctors proclaim them fit to serve, but neither has agreed to throw open his medical charts to prove it.
Mr. Biden released a six-page summary of medical test results in February, but his doctor has refused to be interviewed by reporters, breaking from past practice.
Mr. Trump has revealed less than Mr. Biden; his last public note from his doctor, in November, was three paragraphs long.
Persons:
John McCain, Biden, Donald J, Trump