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Who is the oldest person to become president?

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The youngest person to assume the office was Theodore Roosevelt, who became president at the age of 42 years, 322 days, following William McKinley's assassination; the oldest was Donald Trump, who was 70 years, 220 days old at his inauguration. read more

Trump Would Be Oldest President Ever To Take Office (With Clinton Close Behind) Donald Trump is 70 today. If he were elected, he'd be the first newly inaugurated, over-70 president. But Hillary Clinton isn't far behind. read more

The oldest president in office was Ronald Reagan, but the oldest to become president is Donald Trump. Trump has Reagan beat by nearly 8 months, entering office at the age of 70 years, 220 days. read more

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