A majority of voters have concerns for President Joe Biden's mental and physical health, specifically as it concerns capabilities required to be commander-in-chief.

A NBC News poll shows 68% have major or moderate concerns with Biden's mental and physical health related to his job as president, compared to just 32% who have minor or no real concerns related to his health.

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Of those polled, 60% also said they have major or moderate concerns with his ability to finish another four-year term, whereas only 40% had minor or no concerns.

If reelected in 2024, Biden would be 82-years-old on inauguration day in 2025, and 86 when leaving office on Jan. 20, 2029. He is currently the oldest president in U.S. history. The frontrunner in the Republican presidential primary, former President Donald Trump, was the second oldest president in U.S. history, based on the time he entered office.

Voters in the survey also had concerns about Trump's mental and physical health, with 55% responding to having major or moderate concerns, and only 44% saying they have minor or no concerns about the former president's physical or mental health.

When asked whether Trump would be able to serve a full term if elected in 2024, 58% expressed major or moderate concerns, compared to 42% who expressed minor or no concerns. If Trump is elected in 2024, he would be 78-years-old on inauguration day in 2025, and 82 when leaving office on Jan. 20, 2029.

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The same poll showed Trump still holding a commanding lead over the Republican primary field at 51%, with Gov. Ron DeSantis (R-FL) coming as the next closest candidate with 22%.

In a hypothetical general election match-up between Trump and Biden, the current president leads 49%-45%, while DeSantis and Biden remain tied at 47%, respectively.