As Biden departs, Trump set to face questions over his age and acuity

With 78-year-old Donald Trump now certain to face a Democratic candidate younger than he is, the Republican could have the tables turned on him over the questions of age and mental agility that he often sidestepped while Joe Biden was his opponent.

Last month, for example, Trump got the name of his own doctor wrong. Previously he has made high-profile campaign trail gaffes, in which he seemed to think Barack Obama was still president and mistook his arch Republican rival Nikki Haley for Nancy Pelosi.

But that pledge dissolved on Saturday when he returned to disparaging Biden, Harris and the Democratic agenda and has been delivering his usual rants on the campaign trail, often laced with conspiracy theories and even a repeated and bizarre reference to a shark.

Read more about Joe Biden dropping out of the 2024 election: