Labour government, 1974–1979
In March 1976, having just turned sixty years old, Wilson resigned as Prime Minister, ending his leadership of the Labour Party after thirteen years, and a total of nearly eight years as Prime Minister. He was replaced by James Callaghan, who had held senior government positions during both of Wilson's ministries, and had served as a Shadow Cabinet member in the early-1960s.
James Callaghan
Barely two years after beginning his second spell as Prime Minister, Wilson announced his surprise resignation on 16 March 1976, and unofficially endorsed Callaghan as his successor. Callaghan was the favourite to win the leadership election; although he was the oldest candidate, he was also the most experienced and least divisive. Popularity with all parts of the Labour movement saw him through the ballot of Labour MPs to win the leadership vote. On 5 April 1976, at the age of 64 years and 9 days, Callaghan became Prime Minister—the oldest person to become Prime Minister at time of appointment since Winston Churchill.