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Donald Trump said he feels "young" and "vibrant" at the age of 72 and that he can beat 76-year-old Joe Biden in a possible presidential race "easily".

At White House press conference on Friday a reporter asked Mr Trump how old is too old to be president of the United States.

The US president replied: "I just feel like a young man. I'm so young.

“I can't believe it. ... I'm a young vibrant man."

Mr Trump reportedly went on to smile and say that he is not sure about Democratic presidential contender Joe Biden, who is the second-oldest contender in the race behind Bernie Sanders.

He said: "I look at Joe. I don't know about him."

But he added that he would never say anyone is too old to be president.

Earlier on Friday, the president was ridiculed on social media after spelling the word “chief” in which he claimed to be quoting his country's chief hostage negotiator.

He wrote: ““President J. Trump is the greatest hostage negotiator that I know of in the history of the United States.

“20 hostages, many impossible circumstances, have been released in the last two years. No money was paid.” Chief Hostage Negotiator, USA!”

The post racked up more than 22,000 comments with people flagging up the spelling error, with one commenter saying: “My 9-year old can spell "chief."

Another wrote: “If you can’t spell chief, you aren’t fit to be ‘Commander in Chief’”