The Democratic presidential primary in 2020 could include as many as five candidates over the age of 70.

Four out of the five are older than President Donald Trump, who at age 70 became the oldest elected first-term president in American history. All five will be older on Inauguration Day 2020 than Trump was when he began his first term in office.

Former Secretary of State John Kerry, 74, declined to rule out running in 2020 in a CBS News interview that aired on Sunday. Kerry turns 75 in December and would be 77-years-old by the time he took office.

Vermont Sen. Bernie Sanders, who turns 77 on Saturday, would be 79 by the time he entered the White House. Sanders is technically an independent but caucuses with Democrats in Congress and ran for president as a Democrat in 2016. Sanders is all-but-guaranteed to run again in 2020.

Former Vice President Joe Biden, 75, is positioning himself for a 2020 presidential run as well. If he won, Biden wouldn’t take office until after his 78th birthday.

Massachusetts Sen. Elizabeth Warren turned 69 in June and is also considered a virtual lock to run in 2020. Though younger than the president, Warren at age 71 would still be the oldest first-term president in American history.

Former California Gov. Jerry Brown will be the oldest candidate in the field if he runs in 2020. The former governor turned 80 this past April and would be 82 by the time he took office in 2021.

Still, Brown said last year not to “rule it out” that he would run and his name has been consistently floated as a candidate since then.

If he won, Brown would be more than a decade older than any other first-term president.

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