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 Croatia Yugoslav Federation. Following the January 2000 general election the winning centre-left coalition led by the Social Democratic Party amended the Constitution and effectively stripped the President of most of his executive powers, strengthening the role of the Parliament and the Prime Minister, turning Croatia into a parliamentary republic. The Prime Minister again (as before 1990) became the foremost post in Croatian politics. To date there have been twelve Prime Ministers who have chaired 14 governments since the first multi-party elections. Nine Prime Ministers were members of the Croatian Democratic Union during their terms of office, two were members of the