Washington (CNN) Former Vice President Joe Biden said it's "totally appropriate" for people to consider his age when evaluating him as presidential candidate.

"Just like when I was 29, was I old enough? And now, am I fit enough? I'll completely disclose everything about my health. I'm in good shape," Biden said in a Friday interview with a New Hampshire newspaper, The Laconia Daily Sun

Since officially launching his presidential bid in April, Biden has polled above the rest of the crowded Democratic primary field. But he would be the oldest president to be sworn in for their first term, raising questions about whether the 76-year-old statesman can beat his Democratic challengers -- many of whom are much younger than he is -- and handle a grueling presidential campaign with his admitted propensity for gaffes in order to beat President Donald Trump in 2020.

If he were to win the White House, Biden would be 78 years old when he's sworn into office in 2021 -— which would make him the oldest president at the beginning of his first term in American history.

Biden also addressed a moment during the CNN climate crisis town hall Wednesday when his left eye appeared bloodshot, chalking it up to an issue with his contact lens.

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