 Pull up the Reagan clip for me, please. If you want to get a sense of how unprecedented this is, you have to put in historical context here. Back in 1984, when Ronald Reagan was 73 years old and running against Walter Mondale, there was a lot of talk about whether he was too old to be president. Both Republicans and Democrats were asking about Reagan's cognitive abilities as a serious issue. Here's how Ronald Reagan handled that topic with all the scrutiny.