quality:correction, linguistic:voice_change
Later life

Upon leaving the premiership in 1972 to an approval rating of 19% (by April) and a fractured party, Satō moved back to his home in Setagaya Ward, Tokyo, staying out of the eyes of the media but remaining in the Diet. His reputation, however, quickly began to be rehabilitated, starting in November of that year with his awarding of the Grand Cordon of the Supreme Order of the Chrysanthemum. Satō opened up to the media after the award, with outlets noting his visual image change, with a longer hairstyle reminiscent of the post-presidency of Lyndon B. Johnson.

Satō quickly settled into his life as an elder statesman. In January 1973, Satō and his wife were invited to President Richard Nixon's second inauguration. Satō maintained close relations with Nixon, sending him his personal condolences upon his resignation and attending his funeral.

Upon returning to Japan, his successor, the initially-popular Kakuei Tanaka, who had been handed a rebuke with 17 seat losses in the 1972 Japanese general election, looked to Satō to repair relations within the LDP, especially towards his rival Takeo Fukuda. Both men were Satō's protegés, and Satō advised Tanaka in the forming of his post-election cabinet, notably including Fukuda as director-general of the Administrative Agency. Although privately critical towards Tanaka's government, Satō remained in the public eye a unifier within the LDP.

Satō shared the Nobel Peace Prize with Seán MacBride in 1974. He was awarded for representing the Japanese people's will for peace, and for signing the nuclear arms Non-Proliferation Treaty in 1970. He was the first Asian to accept the Nobel Peace Prize. (In 1973, Vietnamese politician Le Duc Tho had become the first Asian to win the prize, but Tho had rejected it.) Satō began working with McBride shortly after, joining Amnesty International.

In April 1975, as part of his last foreign visit before his death, Satō was chosen as the LDP representative to attend the funeral of Chiang Kai-Shek. However, upon protest from the Chinese government of Satō's role as "official envoy of the LDP president", his role was relegated to a "friendship representative".