Former Japanese Prime Minister Toshiki Kaifu, Passes Away at 91 January 18, 2022 Monika Singh Former Japanese Prime Minister Toshiki Kaifu, Passes Away at 91 The former Prime Minister of Japan, Toshiki Kaifu has passed away. He was 91. Kaifu served as the Premier of the country for about two years from August 1989, until November 1991.