Who was the oldest Prime Minister?

A black and white photographic portrait of a man with white hair wearing a suit and tie.

Sir Robert Menzies.

John Curtin Prime Ministerial Library (JCPML00036/11)

Sir Robert Menzies.

A black and white photographic portrait of a man with white hair wearing a suit and tie.

John Curtin Prime Ministerial Library (JCPML00036/11)

Description

A portrait of Sir Robert Gordon Menzies. 

John Curtin Prime Ministerial Library. Records of the Government Photographic Service. Sir Robert Gordon Menzies, KT,PC,CH (1894-1978) Prime Minister 1939-1941, 1949-1966.

The oldest person to become Prime Minister was John McEwen, who was 68 when he took office.

Robert Menzies was the oldest serving Prime Minister. He retired from his position as Prime Minister and from parliament when he was 71 years old.