Sen. Bernie Sanders is not ruling out the possibility of another run for president, telling the Associated Press on Thursday that he's taking it "one thing at a time."
"Four years is a long time from now," Sanders told the AP. "We'll take one thing at a time, but I'm not ruling out anything."
Sanders is currently 75 years old.
Hillary Clinton and Bernie Sanders together
Hillary Clinton and Bernie Sanders together
Democratic U.S. presidential candidate Hillary Clinton and Sen. Bernie Sanders stand together during a campaign rally where Sanders endorsed Clinton in Portsmouth, New Hampshire, U.S., July 12, 2016. REUTERS/Brian Snyder - TPX IMAGES OF THE DAY
LAS VEGAS, NV - October 13: Bernie Sanders and Hillary Clinton pictured at the 2015 CNN Democratic Presidential Debate at Wynn Resort in Las Vegas, NV on October 13, 2015. Credit: Erik Kabik Photography/ MediaPunch/IPX
Sen. Bernie Sanders, of Vermont, left, and Hillary Rodham Clinton laugh during the CNN Democratic presidential debate Tuesday, Oct. 13, 2015, in Las Vegas. (AP Photo/John Locher)
Democratic presidential candidates Hillary Rodham Clinton, left, Sen. Bernie Sanders, I-Vt., center, and former Maryland Gov. Martin O'Malley, talk backstage before the start of the Iowa Democratic Party's Jefferson-Jackson Dinner, Saturday, Oct. 24, 2015, in Des Moines, Iowa. (AP Photo/Charlie Neibergall)
Bernie Sanders, left, offers an apology to Hillary Clinton during a Democratic presidential primary debate Saturday, Dec. 19, 2015, at Saint Anselm College in Manchester, N.H. (AP Photo/Jim Cole)
Democratic presidential candidate, Hillary Clinton and Democratic presidential candidate, Sen. Bernie Sanders, I-Vt. speak during a break at the NBC, YouTube Democratic presidential debate at the Gaillard Center, Sunday, Jan. 17, 2016, in Charleston, S.C. (AP Photo/Stephen B. Morton)
Democratic presidential candidate, Sen. Bernie Sanders, I-Vt, reacts to Democratic presidential candidate, Hillary Clinton's answer to a question during a Democratic presidential primary debate hosted by MSNBC at the University of New Hampshire Thursday, Feb. 4, 2016, in Durham, N.H. (AP Photo/David Goldman)
Democratic presidential candidates Sen. Bernie Sanders, I-Vt, left, and Hillary Clinton take the stage before a Democratic presidential primary debate at the University of Wisconsin-Milwaukee, Thursday, Feb. 11, 2016, in Milwaukee. (AP Photo/Tom Lynn)
Democratic presidential candidates, Hillary Clinton and Sen. Bernie Sanders, I-Vt, shake hands before the start of the Univision, Washington Post Democratic presidential debate at Miami-Dade College, Wednesday, March 9, 2016, in Miami, Fla. (AP Photo/Wilfredo Lee)
Democratic presidential candidate Sen. Bernie Sanders, I-V.t, right, speaks as Hillary Clinton listens during the CNN Democratic Presidential Primary Debate at the Brooklyn Navy Yard on Thursday, April 14, 2016 in New York. (AP Photo/Seth Wenig)
Democratic presidential candidate Hillary Clinton listens as Sen.Bernie Sanders, I-Vt. speaks during a rally in Portsmouth, N.H., Tuesday, July 12, 2016, where Sanders endorsed Clinton. (AP Photo/Andrew Harnik)
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In four years, he'd be 79, and would be 83 at the end of his first term if he won. That's older than President-elect Donald Trump, who at 70 will be the oldest person to assume the office.
Aside from talking about his political ambitions, Sanders also reflected on the 2016 campaign and the defeat of Hillary Clinton — whom Sanders campaigned hard for in the final days of the race.
Sanders blamed the loss on a "lack of enthusiasm" from Democrats.
"People just did not come out to vote," he told the AP.
He added that the Democratic Party has a messaging problem, given that historically Democratic white working-class voters backed Trump and the GOP in massive numbers.
"It is an embarrassment, I think, to the [entirety] of Democratic Party that millions of white working-class people decided to vote for Mr. Trump, which suggests that the Democratic message of standing up for working people no longer holds much sway among workers in this country," Sanders told the AP.
Sanders added that he is not optimistic about his ability to work with Trump.
"I hope I'm wrong, but I believe that he is a fraud, and I think despite all of his rhetoric about being a champion of the working class, it will turn out to be hollow," Sanders said.