The classification is as follows: young people are under 44 years old, middle-aged people are 45-59 years old, young people are 60-74 years old, old people are 75-89 years old, and those who live long are over 90 years old.

This is a new age division standard put forward by WHO according to the living standard and life expectancy of modern people. According to this standard, in fact, before the age of 75, it is not old, but only the preparation stage of old age.

Youth is the best golden stage;

Entering the society, I began to rush about for work and realized my due value. Usually people of this age are particularly stressed. Keep learning after work and realize greater value for yourself. However, it should be noted that you must not run around and study hard for work and burn your body, otherwise the loss will outweigh the gain.

When the physical function of middle-aged people begins to gradually weaken, from the physical point of view, the metabolic rate of this age group will slowly slow down, and the functions of various organs of the body will also be weakened to varying degrees. The body is not as good as that of young people, and there are often many diseases in this age group. Therefore, middle-aged people should pay special attention to health and go to the hospital on time.

From the psychological and social experience, this time is like the noon sun, which is a very prosperous stage. With a lot of life experience, after entering middle age, people's mentality will be particularly mature and they will know which is more important, so we often see the reason why there are fewer young people in the top backbone of the company.