Bernie Sanders’ supporters jumped on the 78-year-old candidate’s call to “go to the YouTube” during Sunday night’s 11th Democratic primary debate.

The Vermont lawmaker sounded every bit his age when he urged viewers to go to “the” YouTube — instead of just YouTube — in the midst of a heated exchange with Joe Biden over social security.

“You have been on the floor of the Senate time and time again, touting the need to cut Social Security, Medicare and veterans’ programs,” Sanders said to Biden.

But Biden, 77, denied that he called for those cuts — prompting Sanders to say: “America, go to the website right now. Go to the YouTube right now.”

“Go to the YouTube” quickly began trending on Twitter, with some poking fun at Sanders for the gaffe and others using it to magnify his attacks on Biden.

Sanders’ campaign repeated the line in a tweet, with a link to a campaign ad on YouTube.

The Biden campaign, meanwhile, urged people to instead check a Politifact article that stated the former vice president’s position on cutting benefits has changed over time and called the ad “misleading.”