1. Ministry of Health, Labour and Welfare (2020) Overview of Life Table 2, Life Expectancy of Major Ages. 2. https://www.mhlw.go.jp/toukei/saikin/hw/life/life20/dl/life18-02.pdf
2. Ministry of Health, Labour and Welfare (2020) Overview of Life Table 5, International Comparison of Life Expectancy. 4. https://www.mhlw.go.jp/toukei/saikin/hw/life/life20/dl/life18-04.pdf
3. Cabinet Office (2022) Status of Aging and Future Prospects. Aging Society Whitepaper 2022: Status of Aging and Current Status of Measures to Deal with an Aging Society, 2-6. https://www8.cao.go.jp/kourei/whitepaper/w-2022/zenbun/pdf/1s1s_01.pdf
4. Fire and Disaster Management Agency, Ministry of Internal Affairs and Communications (2021) Current Status of Emergencies and Rescues, 2021 (Rapid Version 1). p. 25. https://www.fdma.go.jp/publication/rescue/items/kkkg_r03_01_kyukyu.pdf
5. Fire and Disaster Management Agency, Ministry of Internal Affairs and Communications (2021) Current Status of Emergencies and Rescues, 2021 (Rapid Version 1). p. 21. https://www.fdma.go.jp/publication/rescue/items/kkkg_r03_01_kyukyu.pdf