He was Australia 's shortest-serving Prime Minister , and he lived longer than any other Prime Minister , until Gough Whitlam , who surpassed Forde 's age on January 21 , 2009 . The shortest-serving prime minister in Australian history â `` his term of office lasted only eight days â `` Forde was previously the longest-lived Australian prime minister ( living ) , until he was surpassed by Gough Whitlam on 21 January 2009 .