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
Deputy Prime Minister (Denmark) In some cases the leader of the third largest coalition party, who is as a matter of course third in precedence, has been called 2nd deputy prime minister (2. "vicestatsminister"). This tradition goes back at least to 1957. Deputy Prime Minister (Denmark) Deputy Prime Minister (Danish: "vicestatsminister") is an informal description sometimes used, especially by the press, for the minister who is second in the order of precedence. This is the minister who will usually be appointed as acting prime minister when the prime minister is unavailable. Traditionally the minister of foreign affairs holds the second rank. It is only