Office of the Prime Minister (Canada) December 21, 2015, the new Prime Minister Justin Trudeau was still in the process of hiring staff. However, he announced some key positions as well as his office's directorates: The Office of the Prime Minister was a fairly weak and secondary group before Pierre Trudeau became prime minister in 1968, after whose appointment much of what had previously been the responsibility of the Privy Council Office was shifted to the PMO. After that point, the PMO became more central to the government, and many of Trudeau's economic and constitutional initiatives were launched with the aid and advice of its staff.
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