After US President Joe Biden announced he was tossing his hat in the ring for a second term, we ask about his fitness for the job. Is Biden up to the task of being once again the world's most powerful person? More broadly, is US politics skewed towards seniority? Is it a misperception that the baby boomer generation born before 1965 continues to hold a lock on power? Can Biden – and Donald Trump, for that matter – convince the voters?
Produced by François Picard, Andrew Hilliar and Clemence Waller