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
Minister of External Affairs (India) Minister post throughout his 17-year premiership of the country; he remains the country's longest-serving Foreign Minister. Several other Prime Ministers have since held the additional charge of foreign minister, but never has any other cabinet minister held additional charge of the office. There have been a number of Foreign Ministers who went on to become the Prime Minister like Atal Bihari Vajpayee, P. V. Narasimha Rao and I. K. Gujral. The current Minister of External Affairs is Sushma Swaraj of the Bharatiya Janata Party, who took over from Salman Khurshid of the Indian National Congress on 26 May 2014 Minister