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
Office of the Prime Minister (Thailand) invoked his special powers under Section 44 of the interim charter to create 50 posts at the OPM for civil servants being investigated for alleged wrongdoing. Transferred officials will continue to receive their salaries. The OPM budget for fiscal year 2019 (FY2019) (1 October 2018–30 September 2019) is 41.216.2 million baht. Its budget was 36,001.3 million baht in FY2016, 35,412.3 million baht in FY2017, and 34,256.5 million baht in FY2018. Office of the Prime Minister (Thailand) The Office of the Prime Minister (; ; Abrv: OPM) is the central executive agency in the Government of the Kingdom of Thailand. It