She managed her family's textile business during World War II and lived to the age of 116 years and 220 days.

[1] During World War II, she took on the responsibility of managing the family business in Japan while her husband worked at a factory in Korea, then under Japanese colonial rule.

[4] Itooka attributed her longevity to eating bananas and drinking Calpis, a Japanese dairy-based beverage.

[3] She was recognized as the oldest living person by Guinness World Records in September 2024 after the death of Maria Branyas.

[1] Following her death, 116-year-old Inah Canabarro Lucas of Brazil became the world's oldest living person and the last survivor born in 1908.