Any concerning health issues the American public should know about, Mr President? "Well, they think I look too young," Joe Biden, then aged 81, joked after his annual medical check-up as the oldest president in US history. The US president is one of the most powerful people on the planet - and the public scrutiny of their health records has grown into a distinctly American phenomenon. Every president in modern history has taken the short journey from the White House to Walter Reed National