Sen. Bernie Sanders Bernie SandersThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Bernie Sanders: 'This is an election between Donald Trump and democracy' The Hill's 12:30 Report: Trump stokes fears over November election outcome MORE (I-Vt.) said on Sunday that disqualifying a candidate solely on age would be a “pretty superficial answer."

“I think age is certainly something that people should look at. They should should look at everything. Look at the totality of the person. Do you trust that person? Is that person honest? Do you agree with that person? What is the record of that person,” the Democratic presidential candidate told NPR’s Politics Podcast.

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But Sanders, 77, doesn’t think a candidate’s age is the best judge of success.

“But just say, you know, 'I’m gonna vote for somebody because they’re 35 or 40, and I’m not going to vote for somebody in their 70s,' I think that’s a pretty superficial answer,” Sanders told NPR.

Sanders is the oldest candidate in the 2020 race but Biden is close behind at 76. If elected, either would be the oldest sitting president, breaking the record set by President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE who is 73.

Sanders and Biden face a diverse field of candidates, with Swalwell, Rep. Tulsi Gabbard Tulsi GabbardRepublicans call on DOJ to investigate Netflix over 'Cuties' film Hispanic Caucus campaign arm endorses slate of non-Hispanic candidates Gabbard says she 'was not invited to participate in any way' in Democratic convention MORE (D-Hawaii) and South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBillionaire who donated to Trump in 2016 donates to Biden The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice MORE (D-Ind.) nearly four decades younger.

When Biden first ran for president in 1988, Buttigieg, Swalwell and Gabbard were just 6 years old.

Despite being the oldest candidate in the field, Sanders’s base is largely made up of younger voters who have backed the progressive senator in polls.