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
Members of the Australian House of Representatives, 1949–1951 led by Arthur Fadden won a net of 48 additional seats, allowing it to form government. The incumbent Australian Labor Party led by Prime Minister of Australia Ben Chifley won a net of four additional seats and the four representatives of minor parties and an independent were all defeated. Members of the Australian House of Representatives, 1949–1951 This is a list of the members of the Australian House of Representatives in the 19th Australian Parliament, which was elected at the 1949 election on 10 December 1949. In the first of two significant expansions, the house was expanded by 48 seats,