Northeast Asian countries including China, Japan, and Korea are rapidly aging while experiencing a significant success in their economic development. As of 2023, the percentage of people aged 65 or older among these three countries is 15.4% (China), 18.0% (Korea), and 29.1% (Japan) respectively, which shows that the society aging is a major issue of policy makers.

 Particularly, the percentage of the elderly in Japan increased from 14% in 1994 as an aging society to 27.7% in 2017, becoming a superaged society. While the number of elderly people is increasing, the percentage of the economically active population between 15 and 64 in age is decreasing. In 2015, The ratio of persons aged 65 or older to economically active persons has decreased down to 1:2.3. Aging is expected to accelerate up to the point of 1:1.3 by 2065. Particularly in the superaged society of Japan, aging of caregivers who take care of an elderly one is also accelerating: It is now a society where an elderly person cares for another elderly person. As employed caregivers are aging and many of them retire, the insufficiency of caregivers is also a serious issue.