Nathan Howard/Getty Images
- Concerns about President Joe Biden's fitness and age have been raised by voters.
- Those issues were compounded by a Special Counsel report painting him as an "elderly man with a poor memory."
- Polls suggest a different Democratic nominee could fare better against Trump in a general election.
Concerns about President Joe Biden's age and fitness go back years, and polling has consistently shown voters of both political parties are concerned about his age.
Biden is 81, and would be 82 if he was sworn in for another term.