<page_title> List of presidents of the United States by age </page_title> <section_title> Table </section_title> <table> <cell> Theodore Roosevelt <col_header> President </col_header> <col_header> Age </col_header> </cell> <cell> 42 years, 322 days Sep 14, 1901 <col_header> Age at start of presidency </col_header> </cell> <cell> Donald Trump <col_header> President </col_header> <col_header> Age </col_header> </cell> <cell> 70 years, 220 days Jan 20, 2017 <col_header> Age at start of presidency </col_header> </cell> </table>
The youngest was Theodore Roosevelt, who became president at the age of 42 years and 322 days, while the oldest was Donald Trump, who was 70 years and 220 days.