The agribusiness company Cargill said Tuesday that its chief executive, Warren R. Staley, would retire June 1 after reaching 65, the company’s retirement age for executives.

Mr. Staley will be succeeded by Gregory R. Page, 55, who has been Cargill’s president and chief operating officer since 2000. Mr. Page joined Cargill in 1974 as a trainee. He worked in the company’s United States animal nutrition business before transferring to Singapore in 1985 to run the animal nutrition operations in Asia. He returned to the United States in 1992. He began running Cargill’s North American and Australian beef and pork operations in 1995. Mr. Staley became Cargill president in 1998, chief in 1999 and chairman in 2000. He has worked at Cargill since 1969.