"Aging Economics" is a course that analyzes the relationship between the declining birthrate, aging population, and the economy and society using economic methods. Specifically, it analyzes the impact of demographic changes, known as a declining birthrate and aging population, on the "economy," such as consumption, savings, labor supply and demand, and economic growth, and conversely, the impact of current economic and social systems (such as tax systems, social security systems, and employment practices in companies) on people's lifestyles, such as marriage and birth behavior, using economic methods. Based on this, it considers how to design a fiscal and social security system appropriate for a society with a declining birthrate and aging population.