What science tells us about Biden, Trump and evaluating an aging brain

The 2024 presidential election has turned into a crash course in gerontology.

On Election Day, former president Donald Trump will be 78 years old, and President Biden will be a couple weeks shy of 82. Never have two people of such advanced age been the nominees of the major political parties, nor has there been a campaign so rife with suspicions and allegations that candidates are showing signs of age-related cognitive decline.