The 2024 election begins as a high-stakes staring contest.

President Joe Biden and former President Donald Trump have both told aides and confidants that they're more likely to run for the White House next cycle — and confident in their chances of winning — if the other runs, too. But as each camp gears up for a rematch of the bitterly contested 2020 contest, there remains a small hiccup: Neither is inclined to take the plunge first.

It's a game of political chicken that — as described by more than a half dozen advisers to the two men — has largely frozen the field among Democrats and Republicans alike, raising questions about the future health of two parties being led by a pair of candidates who, by that Election Day, would have long ago celebrated their 75th birthdays.