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 the Czech Republic provides that upon the accession to the office each Prime Minister must gain and thereafter maintain the confidence of the Parliament. As soon as the Prime Minister loses the confidence he or she is forced to resign and the President is obliged to choose a new Prime Minister. The Prime Minister is the most powerful office in state, since they command and preside over the Government. The President appoints the Prime Minister who appoints other Ministers of the Cabinet of the Czech Republic. The official residence of the Prime Minister of the Czech Republic is Kramář's Villa (Czech: "Kramářova vila").