What age group is 40 to 50 years old?

40 to 50 years old belongs to the middle age stage. In ancient times, forty was called prime of life, and fifty was called old age.

Internationally, the population is usually divided into different groups according to 0~ 14 years old, 15~64 years old and over 65 years old, which are called juvenile population, mature population and elderly population respectively. The juvenile population coefficient, the mature population coefficient and the elderly population coefficient are calculated according to the total population, and the dependency coefficient is also calculated according to the mature population, that is, the dependency coefficient = (juvenile population+elderly population