<page_title> List of Prime Ministers of Australia by age </page_title> <section_title> Overview </section_title> <table> <cell> Edmund Barton <col_header> Prime Minister </col_header> </cell> <cell> 7 Jan 1920 <col_header> Died </col_header> </cell> <cell> Joseph Cook <col_header> Prime Minister </col_header> </cell> <cell> 30 Jul 1947 <col_header> Died </col_header> </cell> </table>
Joseph Cook was the oldest living prime minister for a span of over 27 years, following the death of Edmund Barton in 1920.