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
Deputy Prime Minister of Yugoslavia Deputy Prime Minister of Yugoslavia The Deputy Prime Minister of Yugoslavia was the official Deputy of the Prime Minister of the Kingdom of Yugoslavia, SFR Yugoslavia and later Prime Minister of FR Yugoslavia, from 1939 until 2003. The office of the Deputy Prime Minister of the Kingdom of Yugoslavia was established on 26 August 1939, during the government of Dragiša Cvetković. It was initially held by Vladko Maček. The office of the Deputy Prime Minister of SFR Yugoslavia was established on 2 February 1946, during the government of Josip Broz Tito. It was initially held by two people: Edvard Kardelj