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 Laos the People's Democratic Republic traces its lineage back to Kaysone Phomvihane, the first Prime Minister of the People's Democratic Republic. The predecessor office to the Prime Minister of the People's Democratic Republic was the Prime Minister of the former Kingdom of Laos. There have been 7 prime ministers of the People's Democratic Republic, but there have been 17 prime ministers of Laos if the prime ministers of the Kingdom of Laos are counted. Between December 1959 to December 1960, Laos had six different Prime Ministers, who were ousted by six successive political coups. Prime Minister of Laos The Prime Minister