Biden, Trump asked about voter concerns about their age
Moderator Dana Bash asked Biden, 81, and Trump, 78, to address voter concerns about their age.
"First of all, I spent half my career being criticized for being the youngest person in politics," Biden said. "I was the second youngest person ever elected to the United States Senate. And now I'm the oldest. This guy's three years younger and a lot less competent."
Biden said voters should look at his record and what his administration's accomplished.
Trump pointed to the "cognitive test" he's taken. In 2018, he took the Montreal Cognitive Assessment, a test designed to detect early signs of memory loss and other mild cognitive impairment.
"He took none," Trump said of Biden. "I'd like to see him take one, just one, a really easy one. Like go through the first five questions, he couldn't do it."