He was 45 years old.
Robert Walpole was 44 years when he became prime minister.
Harold Holt was born on 5 August 1908, and became Prime Minister in January 1966. He was 57 when he became Prime Minister.
When David Cameron became Prime Minister in May 2010, he was 43 years old. He is the youngest Prime Minister since Robert Jenkinson in 1812 who was 42 years old at the time.
45
57 years old.
31 years old yay
Brian Mulroney became the 18th Prime Minister of Canada on 1984 September 17, and continued as Prime Minister until 1993 June 25.
Winston Churchill was 66 years old when King George appointed him to be the prime minister after Neville Chamberlain died. He became the Prime Minister again in 1950. Even though he was fairly old to be the prime minister he was a formidable man. He lived to be almost 90 years old.
Churchill became prime minister at the age of 66.
Margaret Thatcher became Prime Minister of the United Kingdom on May 4, 1979. She was born on October 13, 1925, which means she was 53 years old when she assumed office. Thatcher served as Prime Minister until November 28, 1990, making her the longest-serving British prime minister of the 20th century.
Tony Blair became British Prime Minister on May 2nd 1997, four days before his 44th birthday.
48-64 years old. Pierre Trudeau first became the Prime Minister of Canada when he was 48. He briefly lost power to Joe Clark when he was 59, but regained power next year when he turned 60. He retired as Prime Minister when he was 64.