The age question for presidential candidates is more than four decades old. President Ronald Reagan answered it with a pledge to resign if he became impaired, and later with a clever joke that reset his campaign from a stumbling debate performance to a 49-state landslide and a second term.

“I will not make age an issue of this campaign,” Reagan said to the question he knew was coming in perhaps the most famous mic-drop moment in campaign history. “I am not going to exploit for political purposes my opponent’s youth and inexperience.”