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 Myanmar was established for her on 6 April 2016. Prime Minister of Myanmar The Prime Minister of Myanmar was the head of government of Myanmar (also known as Burma) from 1948 to 2011. The position of Prime Minister was created in 1948, when Burma gained independence from the United Kingdom. Since then, eleven people have held the office (with two of them doing so on multiple occasions). Due to the country's long period of military rule, it has not been uncommon for the Prime Minister to be a serving (or recently retired) military officer. The actual power of the Prime Minister