 The first general election debate of the 2024 season has kicked off. President Joe Biden and his Republican rival Donald Trump are squaring off as the candidates attempt to lure currently undecided voters. Biden has the opportunity to reassure voters that at 81, he's capable of guiding the U.S. through a range of challenges. The 78-year-old Trump could use the moment to try to appeal to tens of millions that he's temperamentally suited to return to the Oval Office.