So Joe Biden Is Old: The Lines Between Power, Age And Authority U.S President Joe Biden delivers remarks on the Covid-19 response and the vaccination program, in Washington, DC, May 2021. - Alex Edelman - Pool Via Cnp/CNP/ZUMA Despite being mocked on the campaign trail as "Sleepy Joe," Biden has had an energetic and productive first few months in office. -OpEd- Joe Biden has now passed the 100-day mark in office, and is surprising many pundits with his energy and his capacity to make pioneering decisions for his country. And present in many of these conversations is the issue of his age. He's 78, making him the oldest person ever sworn in as president of the United States. Never mind that his opponent, former President Donald Trump — who mocked Biden relentlessly during the campaign as "Sleepy Joe" — isn't that much younger.