(population in millions) 問題 Test exercise Super-aged society of Japan：
According to the two-year data from 2019 to 2021, the total population of Japan decreased by (126.17 - 125.12 =) 1.05 million.
The number of elderly people, as defined by the World Health Organization (WHO), increased by (36.4 million - 35.89 million = 0.51 million =) 510,000.
The aging rate in 2019 was (35.89 million ÷ 126.17 million x 100 =) 28.45%.
The aging rate in 2021 was (36.4 million ÷ 125.12 million × 100 =) 29.09%.
From the above, the aging rate of the Japanese archipelago is rising. 解答 Assessment Super-aged society of Japan：
According to the two-year data from 2019 to 2021, the total population of Japan decreased by million.
The number of elderly people, as defined by the World Health Organization (WHO), increased by .
The aging rate in 2019 was %.
The aging rate in 2021 was %.
From the above, the aging rate of the Japanese archipelago is ( rising ・ falling ). Data 世界の高齢化率 Aging rate of world 2020：
(population in millions) 問題 Test exercise Aging rate of world 2020：
According to the data for 2020, the country with the highest aging rate in the world is , followed by European countries
such as , Finland, Greece, and .
The U.S. has an aging rate of %, and due to its traditional immigration policy, the demographic of（ the United States ・ the European Union ）is younger.
In Asia, the aging rate in countries such as and is less than 10%, while the aging rate in countries
such as , , and Singapore is more than 10%.
As a trend, countries with developed economies have（ lower ・ higher ）aging rates, and countries with positive immigration policies have（ lower ・ higher ）aging rates.
Data shows that countries such as Japan, Italy, and Spain, where the aging rate exceeds 20%, have stagnant .
Not only do the elderly not work,
but the and put pressure on the public finance system, so the entire country will gradually become poorer.
To fight back against the aging of society, many developed countries have adopted policies such as , , and .
The Japanese archipelago has been the subject of research by other countries as the region with the most aging population. 解答 Assessment Aging rate of world 2020：
According to the data for 2020, the country with the highest aging rate in the world is Japan, followed by European countries such as Italy, Finland, Greece, and Germany.
The U.S. has an aging rate of 16.89%, and due to its traditional immigration policy, the demographic of the United States is younger.
In Asia, the aging rate in countries such as India and Indonesia is less than 10%, while the aging rate in countries such as South Korea, China, and Singapore is more than 10%.
As a trend, countries with developed economies have higher aging rates, and countries with positive immigration policies have lower aging rates.
Data shows that countries such as Japan, Italy, and Spain, where the aging rate exceeds 20%, have stagnant GDP economic growth.
Not only do the elderly not work, but the medical costs and pensions put pressure on the public finance system, so the entire country will gradually become poorer.
To fight back against the aging of society, many developed countries have adopted policies such as extending the retirement age, encouraging housewives to join the workforce, and immigrant labor.
The Japanese archipelago has been the subject of research by other countries as the region with the most aging population. 探究学習 Critical thinking：
What factors contribute to the aging rate in the nations and regions? Research the materials and summarize them in 300 words. 探究学習 Critical thinking：
How will the world's aging rate change in the 21st century? Describe in 300 words with results and reasons. 探究学習 Critical thinking：
Traditionally, people over 65 years old have been considered as "elderly," but in recent years, there are more people between the ages of 65 and 74 who are physically and mentally healthy. Some have proposed that people over 75 years old are "elderly." At what age do you consider yourself to be "elderly." Define what is meant by "elderly" in 300 words. 多言語対応 Multilingualism： 韓語 Hanguel：고령화 지수 コリョンファ チスウ 繁体 Traditional Chinese：老齡化指數 簡体 Simplified Chinese：老龄化指数 拼音 Pinyin：：lao3ling2hua4zhi3shu4 lǎolínghuàzhǐshù ラオリムファジイシュウ 探究 Further study： 総務省統計局. Japanese Statistics Bureau. Elderly population. OECD Labour Force Statistics 2020.