“The Late Show” host Stephen ColbertStephen Tyrone ColbertInvesting in our people to get the most out of our city Yang: I've received about 12 apologies from media networks during campaign Scarborough to GOP: 'What job is worth selling your political soul over?' MORE joked about former Vice President Joe BidenJoe BidenThe Hill's Morning Report - House prosecutes Trump as 'lawless,' 'corrupt' What to watch for on Day 3 of Senate impeachment trial Sanders wants one-on-one fight with Biden MORE (D) and his gaffes during the third Democratic presidential primary debate in Houston, Texas Thursday night.

“Now the front-runner, Joe Biden, was feeling the urgency of the national moment,” Colbert said before playing a clip of Biden telling the debate audience “I refuse to postpone one more minute...” 

“...because I clearly don’t have a lot of time left,” Colbert finished, jabbing the former vice president, who appeared on Colbert's show last week, about his age. 

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Colbert also lasered in on Biden’s interjection with Sen. Bernie SandersBernie SandersThe Hill's Morning Report - House prosecutes Trump as 'lawless,' 'corrupt' Tensions between McConnell and Schumer run high as trial gains momentum Sanders wants one-on-one fight with Biden MORE (I-Vt.) while he was responding to a question about health care and saying that Canada and other countries around the world pay less in costs than the United States. 

“This is America,” Biden interjected during Sanders’s statement.

“Take that, take that folks who say Biden is gaffe-prone,” Colbert added. “He just accurately identified which country he is standing in. He’s back baby.”

Colbert also called the moment when Biden accidentally referred to Sanders as the president as “one of his classic gaffes,” and he called out when Biden alleged that parents are told to play a record player because low-income students hear fewer words by the time they enter school.

“Biden got technological when talking about education,” Colbert joked. 

“Just crank the Victrola and put on the Mitch Miller and then get yourself a new wireless set and gather around with the whole family and stare at it and listen to FDR give it good to Tojo and his boys,” Colbert continued, referencing Hideki Tojo, the prime minister of Japan during World War II.

Colbert also mocked former Housing and Urban Development Secretary Julián Castro for accusing Biden of “forgetting” how he described his own health care plan “two minutes ago,” which was widely taken as a shot at Biden’s age. 

“The crowd did not like Julián playing the old man card,” Colbert said. “I think he should really think twice about his new slogan: ‘Castro 2020: Shove the Elderly onto an Ice Floe.’ Don’t worry Julián. It’s not like old people vote.