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 Cambodia Thammayut and Mohanikay order. A cabinet will then be unveiled. The formation of a new government takes place no more than 60 days after the election, as defined in the constitution. The prime minister is assisted by deputy prime ministers. Article 125 of the Constitution states that should the prime minister resign or die in office, an acting prime minister is appointed. The Peace Palace serves as the principal workplace of the prime minister. It was inaugurated on 19 October 2010 by the King. However, the prime minister resides at his own private residence. The powers of the Prime Minister