Jill Biden denied that her husband, former Vice President Joe Biden Joe BidenBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Harris faces pivotal moment with Supreme Court battle MORE, is “too old” for the presidency in an MSNBC interview Thursday.

“Joe has incredible energy, he has incredible passion,” Biden said when asked by MSNBC’s Mika Brzezinski Mika Emilie BrzezinskiMika Brzezinski: 'Super grossed out' by Trump speech attendees 'who put their lives at risk' Trump hurls insults at Harris, Ocasio-Cortez and other women Trump targets 'Complete psycho' Scarborough, 'ditzy airhead' Brzezinski while praising 'Fox & Friends' MORE about concerns that the former vice president, who is 76, is too old for the job. “I don’t think he’s too old, certainly, but that’s up to the voters, and the voters will make that decision when they see him out on the campaign trail, when they meet him at their school or at a rally.”

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Joe Biden would be 77 on Election Day 2020 and, if elected, 78 when he took office in January 2021, which would make him the oldest person ever elected or inaugurated as president.

Jill Biden also said her husband was “wiser” due to his eight years as vice president.

“Times have changed. He’s been out on the trail, he’s learned a lot, and so going forward I think he knows where he wants to go and he’s headed in the right direction,” she said.

The former vice president has led most polls of the crowded Democratic field, usually followed by Sen. Bernie Sanders Bernie SandersOutrage erupts over Breonna Taylor grand jury ruling Dimon: Wealth tax 'almost impossible to do' Grand jury charges no officers in Breonna Taylor death MORE (I-Vt.). In a recent poll, he led the field by more than 20 points, indicating his support has increased since he formally announced his third run for the presidency on April 25.