The 89-year-old Castro made the announcement Friday in a speech at the opening of the Eighth congress of the ruling party, the only one allowed on the island. He said he was retiring with the sense of having "fulfilled his mission and confident in the future of the fatherland." Castro didn't say who he would endorse as his successor as first secretary of the Communist Party. But he previously indicated that he favors yielding control to 60-year-old Miguel Diaz-Canel, who succeeded him as president in 2018 and is the standard bearer of a younger generation of loyalists who have been pushing an economic opening without touching Cuba's one-party system.