Joe Biden's advisers knew in 2020 that his age was an issue for Americans but they successfully painted him as a competent leader who would restore normalcy to the White House after Donald Trump's chaotic presidency. Now that Biden is 81‚ opinion polls show age is even more of a concern for voters ahead of November's election. In office‚ Biden's gait has stiffened‚ he is slower on his feet and he regularly makes verbal mix-ups during speeches‚ at times confusing the names of world leaders...