Immigration has reduced the problem of aging.

Japan's aging population has reached a new high, and the local aging problem is serious for the following reasons:

1. Low fertility rate: In recent years, Japan's fertility rate has remained at a low level, which is mainly caused by the high cost of living, heavy work pressure and increased cost of childcare in modern society. The low fertility rate makes Japan's young labor force insufficient, leading to an increase in the proportion of the elderly population.

2. Longevity: Japan's medical level is high and people's life expectancy is prolonged. With the improvement of living standards and the progress of medical technology, the life expectancy of the elderly is getting longer and longer, which also leads to an increase in the proportion of the elderly population.

3. Immigration policy: Japan is a relatively closed country with strict restrictions on immigration. This makes it impossible for Japan to alleviate the aging problem by introducing a large number of immigrants like other developed countries.

4. Social concept: Japan's traditional family concept and mode of providing for the aged make the elderly prefer to provide for the aged at home rather than choose nursing homes or other institutions for the aged. This social concept also makes the aging problem in Japan more serious.

In response to the aging problem, the Japanese government has taken a series of measures, such as raising the retirement age, encouraging childbearing, and introducing foreign labor. However, the effectiveness of these measures is still limited, and the problem of aging in Japanese society is still serious.

To sum up, Japan's aging population has reached a new high, mainly due to factors such as low fertility rate, longevity, immigration policy and social concept. In order to deal with this problem, the Japanese government needs to take more effective measures to alleviate the social and economic impact of aging.