In 1966 (at the age of 86), although he underwent an operation for his chronic disease, gallbladder inflammation, his recovery was very slow because of his old age and his stay in hospital was prolonged.
1966年（昭和41年、86歳）、持病の胆嚢炎を手術したが、高齢により回復がはかどらず入院が長引く。