He said: “There’s a lot of reason to be hopeful in 2020.
“But for God’s sake, please take advantage of what is available.”
Biden, 79, is the oldest ever President in American history.
He has a reputation for making gaffes and misspeaking throughout his decades long political career including during his presidency.
In several instances, he has referred to Vice President Kamala Harris as ‘President Harris’.
In another example from June last year, Biden referred to Russian President Vladmir Putin as President Trump.
He also appeared to claim that computers could talk during a speech in October last year and struggled to pronounce the name of the Long Beach port chief.
At the COP26 climate conference in November he appeared to fall asleep during proceedings.
A few weeks later he struggled to read from a teleprompter during a speech as he mistakenly read “end of quote” out loud.
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According to a Havard Harris poll, 53 percent of voters have doubts about Biden’s fitness for office and 58 percent felt he was too old to be President.
Many Democrats are sceptical about Biden’s claim that he will run for a second term in 2024.