Why Biden's Age Is a Bigger Issue Than Trump's While both Biden and Trump are over 75, concerns about Biden's age and mental acuity are more prominent than those about Trump. Biden's slips and physical changes have raised doubts among voters, while Trump has not faced the same level of scrutiny. These differences in perception and expectations could impact the upcoming election, as shown in a New York Times/Siena College poll. Physical differences, such as Biden's softer voice and tentative movements, have also contributed to these concerns.