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 Zimbabwe Prime Minister of Zimbabwe The Prime Minister of Zimbabwe was a political office in the government of Zimbabwe that existed on two separate occasions. The first person to hold the position was Robert Mugabe from 1980 to 1987 following independence from the United Kingdom. He took office when Southern Rhodesia became the Republic of Zimbabwe on 18 April 1980. This position was abolished when the constitution was amended in 1987 and Mugabe became President of Zimbabwe, replacing Canaan Banana as the head of state while also remaining the head of government. The office of Prime Minister was restored in 2009