The president considers himself "vibrant" in comparison to rival Joe Biden, who is only four years his senior

Donald Trump — the Oldest U.S. In-Term President at 72 — Calls Himself a 'Young, Vibrant Man'

While taking yet another shot at newly-announced Democratic presidential nominee Joe Biden, President Donald Trump said he considers himself a “young, vibrant man.”

“Mr. President, how old is too old to be president?” a reporter asked Trump, 72, during a press pool at the White House on Friday.

Get push notifications with news, features and more.

“I just feel like a young man. I’m so young,” the president said. “I can’t believe it. I’m the youngest person. I am a young, vibrant man.”

Trump then went in on former Vice President Biden, 76, who announced his presidential bid on Thursday, becoming the 20th Democratic nominee for the 2020 race.

“I look at Joe — I don’t know about him,” Trump said. “I don’t know.”

Image zoom Joe Biden; Donald Trump Ryan Pierse/Getty; GEOFF ROBINS/AFP/Getty

“I would never say anyone is too old,” Trump continued, after he was asked if Biden is too old.

“But I know they’re all making me look very young, both in terms of age and I think in terms of energy. I think you people know that better than anybody,” the president said.

Hours before, Biden addressed his age during his sit-down on The View.

Biden, who would be 78 on Inauguration Day 2021, said, “I think it’s important for people — it’s a legitimate question to ask about my age. Hopefully, I can demonstrate that… with age comes wisdom and experience that can make things a lot better. That’s for you all to decide, not for me to decide.”

This isn’t the first personal attack Trump has made against his latest potential rival in the 2020 race.

Mere hours after the longtime Democrat announced his campaign, Trump responded to Biden’s candidacy on Twitter — by questioning Biden’s intelligence.

“Welcome to the race Sleepy Joe. I only hope you have the intelligence, long in doubt, to wage a successful primary campaign,” the president tweeted.

Image zoom Joe Biden Nathan Congleton/NBC/NBCU

RELATED VIDEO: Joe Biden Announces He Is Running for President Against Donald Trump After Skipping 2016 Race

“It will be nasty – you will be dealing with people who truly have some very sick & demented ideas. But if you make it, I will see you at the Starting Gate!” Trump added.

Trump wasn’t the first to issue a personal challenge.

In his campaign announcement video, Biden made it clear that he’s running to make sure Trump’s presidency is restricted to four years.