With looming age and the upcoming Presidential Elections in the United States, there has been many speculation about Joe Biden's age.

Recently, US President Joe Biden has been declared "fit for duty" with no new health worries, his doctor said Wednesday after the 81-year-old's last medical ahead of an election in which his age is a key issue, often raised by his GOP rival Donald Trump.

The annual examination at the Walter Reed Military Medical Center outside Washington came just weeks after a special counsel report that portrayed him as elderly and forgetful. "He continues to be fit for duty and fully executes all of his responsibilities without any exemptions or accommodations," White House doctor Kevin O'Connor said in a summary.

Biden, who faces a likely rematch with 77-year-old Trump in November's election, himself joked that the only concern was that doctors "think I look too young." "Everything's great," he told reporters at the White House. The only new issue this year was Biden's use of a machine to reduce sleep disruption, along with an emergency dental procedure, O'Connor said after the examination.

He continues to suffer a range of minor issues including a stiff walk due to wear and tear in his spine and a minor heart valve issue but there was no significant change in them from last year, the report said. Crucially, a "reassuring" and "extremely detailed" exam found no sign of neurological problems including Parkinson's or a stroke, it added. "President Biden is a healthy, active, robust 81-year-old male, who remains fit to successfully execute the duties of the presidency," O'Connor concluded.

Biden's routine medical exam comes as voter concerns mount over the age of a leader who would be 86 at the end of a second term in office. The issue was thrust further into the spotlight by the special counsel report. It cleared him of illegally retaining classified documents in his home and garage - but said he would come across to a jury as a "well-meaning, elderly man with a poor memory.