Prime Minister of Australia prime minister, otherwise William McMahon63. Robert Menzies was the oldest person to ever be prime minister, leaving office at 71 years old. The longest-serving Prime Minister was Sir Robert Menzies, who served in office twice: from 26 April 1939 to 28 August 1941, and again from 19 December 1949 to 26 January 1966. In total Robert Menzies spent 18 years, 5 months and 12 days in office. He served under the United Australia Party and the Liberal Party respectively. The shortest-serving Prime Minister was Frank Forde, who was appointed to the position on 6 July 1945 after the death of
26th Battalion (Australia) 26th Battalion: The 26th Battalion was awarded the following battle honours: In 1961, the battalion – although no longer on the Australian Army's order of battle – was entrusted with the three battle honours awarded to the 2/26th Battalion for its service with the 2nd AIF during World War II. The honours it inherited at this time were: Malaya 1941–42; Johore; and Singapore Island. 26th Battalion (Australia) The 26th Battalion was an infantry battalion of the Australian Army. Originally raised in April 1915 for service in World War I as part of the Australian Imperial Force (AIF), it was assigned