Outgoing Vice President Joe Biden on Sunday once again passed up the chance to tamp down speculation about a 2020 run for president – after appearing to joke about the prospect last week.

“Four years is a lifetime in American politics. And I think that nominees are determined by their parties based mostly on what skill set is most needed at that time,” Biden said in an interview Sunday. “And who knows where we're going to be two years from now when people really start looking seriously at what they are going to do.”

Biden very publicly considered running in the 2016 presidential primary race, but ultimately decided against it. A month after Democratic nominee Hillary Clinton lost to President-elect Donald Trump, Biden seemed to tease reporters Monday when he said he’s “going to run in 2020 … what the hell.”

Reporters prodded the veep on whether he was joking, to which he answered: "I'm not committing not to run. I learned a long time ago fate has a funny way of intervening."

Biden later explained on "The Late Show with Stephen Colbert" that he doesn’t plan on running but could not say for sure what he’ll do.

“Hell, Donald Trump’s gonna be 74, I’ll be 77 and in better shape,” he quipped.

Speaking Sunday on CNN’s “State of the Union,” Biden elaborated and kept the door open.

“Look, age could be very much an issue, and it may not be. It depends on the state of my health and the health of whomever is running,” he said.