Prime Minister's Office (Sri Lanka) the Parliament. The office of prime minister was formed in 1947 with D. S. Senanayake becoming the first Prime Minister of Ceylon. It consisted of a Secretary (Permanent Secretary) and an Assistant Secretary, who were officers of the Ceylon Civil Service, and a Private Secretary, along with clerical and support staff based at the Senate Building along with the Senate, Cabinet office and the Ministry of External Affairs and Defence. Since 1960 the prime minister's office has been based at Sirimathipaya Mansion on Sir Ernest de Silva Mawatha (formerly Flower Road), Colombo which was the former residence of philanthropist Sir
Prime Minister of Australia Ben Chifley lived the least of all former prime ministers, as he died one year and six months after his term as prime minister. All other deceased former prime ministers have lived at least another 10 years, with the longest surviving former prime minister being Gough Whitlam, who lived 38 years and 11 months after office, surpassing Stanley Bruce's previous record of 37 years and 10 months. The youngest person to become prime minister was Chris Watson37, who was also 37 when he ceased being prime minister. The oldest person to become prime minister was John McEwen67 as an interim