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
Vice Prime Minister of Mauritius Minister, the National Assembly voted against the bill but provided with an understanding that two cabinet ministers who are senior members just behind the Deputy Prime Minister shall be officially known as Vice-Prime Minister but no office was created, making the position essentially an honorific title. Therefore, in case of absence, illness or sudden death of the Prime Minister, it is only the Deputy Prime Minister who can become the Acting Prime Minister until the Prime Minister resumes office or another is appointed. Vice Prime Minister of Mauritius Vice-Prime Minister of Mauritius () is an honorary title usually carried by