The three front-runners in the Democratic race for the White House defended their ages during Tuesday night's debate, with each one saying they would be able to take on the duties of the presidency.

Former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE, who turns 77 next month, said his age is one of the reasons he decided to jump into the race because the country needs his wisdom and experience.

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He then announced he would release his medical records before the first primary in Iowa.

"We need someone to take office this time around who on day one can stand on the world stage, command the respect of world leaders from Putin to our allies and know exactly what needs to be done to get our country back on track," he said, referring to Russian President Vladimir Putin Vladimir Vladimirovich PutinWatchdog confirms State Dept. canceled award for journalist who criticized Trump Former intelligence agency director Robert Cardillo speaks out against 'erratic' Trump Kremlin: Putin calls for reset between US and Russia on cyber relations before elections MORE.

Sen. Bernie Sanders Bernie SandersSirota reacts to report of harassment, doxing by Harris supporters Republicans not immune to the malady that hobbled Democrats The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election MORE (I-Vt.), who is 78 and suffered a heart attack weeks ago, vowed to mount an aggressive campaign and invited those watching the debate to attend an upcoming rally in Queens, N.Y.

"We are going to be mounting a vigorous campaign all over this country," he said. "That is how I think I can reassure the American people."

Sen. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.), 70, was asked what she'd say to primary voters who think a candidate under 70 years old would have a greater chance of beating Trump — who is 73.

"I will outwork, outorganize and outlast anyone, and that includes Donald Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE, Mike Pence Michael (Mike) Richard PenceFormer Pence aide: White House staffers discussed Trump refusing to leave office Pence vows for law and order everywhere Trump met with chants of protest as he pays respects to Ruth Bader Ginsburg MORE or whoever the Republicans get stuck with," she responded, referencing the vice president.

The front-runners have faced scrutiny over their ages, with Biden and Sanders in particular facing some questions.