Harold Macmillan Years in office: 1957-1963 Born: 10 February 1894 Nickname: “Supermac”, “Mac the Knife” Title: The Earl of Stockton Age assumed office: 62 years 335 days Total time in office: 6 years 281 days Harold Macmillan - Wikipedia, the free encyclopedia Maurice Harold Macmillan, 1st Earl of Stockton, OM, PC (10 February 1894 – 29 December 1986) was Conservative Prime Minister of the United Kingdom from 10 January 1957 to 18 October ... en.wikipedia.org/wiki/Harold_MacmillanHarold Macmillan | Number10.gov.uk Born: 10 February 1894 in London First entered Parliament: 29 October 1924 Age he became PM: 62 years, 335 days Maiden Speech: 30 April 1925 on the www.number10.gov.uk/history-and-tour/prime-ministers-in-history/harold-macmillan Harold Macmillan : Biography Harold Macmillan, the grandson of Daniel Macmillan (1813-1857), the publisher, was born in 1894. In his memoirs he described his mother as having "high standards and demanding ... www.spartacus.schoolnet.co.uk/PRmacmillan.htm