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 Kenya Prime Minister of Kenya The Prime Minister of Kenya was a post in the Kenyan government. The first Prime Minister of Kenya was Jomo Kenyatta who became Prime Minister in 1963. In 1964, Kenya became a Republic; the post of Prime Minister was abolished and Jomo Kenyatta assumed the position of President. Following a power-sharing agreement in February 2008, the post of Prime Minister was recreated that April. The position was again abolished by the 2010 Constitution after the 2013 elections. The last Prime Minister, Raila Odinga, was sworn in on April 17, 2008. He was Kenya's second Prime Minister.