Former U.S. President Jimmy Carter turned 95 yesterday, ahead of the milestone birthday he told a crowd at the Carter Center last month, that he hopes there will be an age limit on the presidency. He explained that “just in foreign affairs [he doesn’t] think [he] could undertake it if [he] was 80 years old in the White House.” Currently, four presidential candidates–Sen. Bernie Sanders, former vice president Joe Biden, former Massachusetts governor Bill Weld and President Donald Trump–would be the oldest president ever inaugurated if they win in 2020.