Once some people start doing it, they find it hard to stop. If elected in 2024, he would be the first president over, like, probably, 100 years old to assume office.
According to the Washington Post:
Sen. Bernie Sanders (I-Vt.) is open to running for president in 2024 if President Biden declines to seek reelection, according to a campaign memo a top political adviser distributed to allies on Wednesday that was shared with The Washington Post.
“In the event of an open 2024 Democratic presidential primary, Sen. Sanders has not ruled out another run for president, so we advise that you answer any questions about 2024 with that in mind,” says the memo from Faiz Shakir, a close Sanders adviser who was his campaign manager when he ran in 2020.