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 Haiti is responsible for national defense. In addition, the Prime Minister oversees the National Commission on Government Procurement (CNMP), a decentralized body. Gérard Latortue served the longest time in office, serving 1,550 days in office. Jacques-Édouard Alexis served the second-longest time in office, serving 1,526 total days during his two terms in office, and was the longest-serving prime minister appointed to the position by an elected president. Prime Minister of Haiti The Prime Minister of Haiti (, ) is the head of government of Haiti. The office was created under the 1987 Constitution; previously, all executive power was held by the