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
Prime Minister of Montenegro Montenegro in charge of creating the first real government of post-war Montenegro, which took place on April 17, 1945. Governments were headed by a Prime Minister until February 4, 1953, by a President of the Executive Council until January 15, 1991, and again by a Prime Minister since then. Prime Minister of Montenegro The Prime Minister of Montenegro (Montenegrin: "Premijer Crne Gore") ("Premier of Montenegro"), is the head of the Government of Montenegro. The role of the Prime Minister is to direct the work of the Government, and to submit to the Parliament the Government's Program, including a list of