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 Australia government and the state governments in which the Prime Minister, the state premiers and chief ministers, and a representative of local governments meet annually. On 1 July 2017, the Australian Government's Remuneration Tribunal adjusted the Prime Ministerial salary, raising it to its current amount of $527,852, which was equivalent then to ten times the wage of the average Australian. As of May 2018, this made the Australian Prime Minister the highest paid leader in the OECD. Whilst in office, the Prime Minister has two official residences. The primary official residence is The Lodge in Canberra. Most Prime Ministers have chosen