Perhaps the specific reason for the adjustment is to increase Japan’s birth rate.

As time goes by, the data on birth rates and population growth rates in many countries are not eye-catching, and even the population growth rates in many countries are negative. As one of the most economically developed countries in Asia, Japan naturally has very advanced project development and science and technology. However, many Japanese factories are facing labor shortages and other conditions. On the one hand, this is because Japan’s young labor force is very limited and the number of elderly people has increased sharply. On the other hand, because Japan has an aging society, welfare benefits and government expenditures have increased. Japan's aging society has become the norm

When the birth rate of a certain country is far lower than the growth rate of the elderly, this causes the population growth rate to decline. When a country maintains relatively sluggish population growth for a long time, the number of elderly people increases rapidly, and it is easy to form an aging society. As a country with rapid economic development, Japan will naturally face an aging society. Nowadays, Japan's aging society has become the norm, and relevant departments need to make general adjustments to ensure that Japan's birth rate increases. Adjusting the adult limit may be related to population growth

Prior to this, relevant Japanese departments rationalized the age of adults, and the age of adults was 20 years old. After people reach the age of 20, they can apply for loans and credit cards. Nowadays, Japan has re-adjusted the age of adulthood to 18 years old, and people can get married at the age of 18. As a result, Japan's birth rate has increased, which may change the situation of an aging society and low population growth rate.

In general, the development and population conditions of each country are different. When developed countries encounter the problem of aging, they will adopt very reasonable plans. In addition, countries with very serious aging societies will also face labor shortages. Factories need to start operations, but if the number of workers does not meet the requirements, it will inevitably affect the development of the national economy.