If Bernie Sanders is elected as President of the United States, he would be by far the oldest in the history of the country. A Clinton campaign backer is prepared, according to Politico, to begin to make this an issue in the campaign. David Brock, the head of a significant PAC that works closely with Hillary's organization, will be calling for the release of Sanders' health records.
Having just released her own health records, partially in response to repeated questions about her own physical fitness, Clinton's pointing out Sanders' age calls into question concerns about her own age. If she's elected, she'll be the second oldest President-elect ever, just behind Ronald Reagan, by less than a year.
Time put together a chart showing the various ages of all the Presidents, at the time of their election, clearly showing how Clinton and Sanders compare:
When Time put these charts together, almost a year ago, Donald Trump wasn't a significant factor in the race, so his name was excluded. As Trump will turn 70 this coming June, if elected he will be 70 years and 5 months old, which would make him the oldest President ever. Trump is 16 months older than Clinton and just less than 5 years younger than Sanders.