Top Democratic presidential candidate Joe Biden has sent a message to the voters who have doubts about his age—they should not vote for him if they are worried, according to NBC News’s Amanda Golden.

In a tweet on Saturday, Aug. 24, Golden quoted Biden as saying, “I say if they’re concerned, don’t vote for me.”

The Democratic 2020 presidential hopeful was responding to a question regarding concerns about his age in a gaggle with reporters in Keene, New Hampshire.

Joe Biden is 76 years old, considered as the Democratic front-runner to challenge President Donald Trump who is 73.

President Trump said in an interview in June that the former vice president under Obama administration “looks like he’s just exhausted.”

According to Daily Caller, worries about Biden’s age in the presidential race have long existed, but have grown louder due to the candidate’s habit of making gaffes and misstatements.

On the same day when he was campaigning in New Hampshire, Biden seemed to think he was in Vermont.

“I’ve been here a number of times. The last time I think was all the way back in 2014, but I’ve been here before that … I love this place. Look, what’s not to like about Vermont in terms of the beauty of it?” Biden said while talking to reporters.

During a visit to Iowa earlier in August, Biden also produced a gaffe when telling a crowd: “Poor kids are just as bright and just as talented as white kids.”

A video clip surged this week describing Biden stumbling over his words in an awkward fashion at a campaign event in Iowa.

“My long friend … time friend, and she’s a friend, she’s been my friend, in and out of public life…” he said.

Biden also recently gaffed that his health care plan was “not quality,” and falsely stated that Martin Luther King Jr. was assassinated in the 1970s.

With such gaffes and misstatements, voters now have reasons to turn their concerns to Biden’s mental state, physical stamina, and energy level.

Includes reporting from Daily Caller