FILE - In this Aug. 8, 2019, file photo, Democratic presidential candidate former Vice President Joe Biden speaks at the Des Moines Register Soapbox during a visit to the Iowa State Fair in Des Moines, Iowa. Three Democrats in their 70s are vying to challenge the oldest first-term president in U.S. history. But science says age isn’t a proxy for fitness. The bigger question is how healthy you are and how well you function. With only a few years separating them, President Donald Trump at 73 has mocked Biden, 76. Biden and Sen. Bernie Sanders, 77, try to showcase physical activity on the campaign trial while 70-year-old Elizabeth Warren even jogs around at rallies. (AP Photo/Charlie Neibergall, File)
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