Jing qi, the same as zheng qi, refers to the matter considered the essence of life and its functions. It usually refers to the essence acquired after birth and the essence contained in internal organs.

1. Why can some people produce offsprings even when they are old?
2. Generally speaking, for men, jing qi will not drain until sixty-four, and for women, not until forty-nine.
3. According to biology, normal life expectancy can be between 120 and 150 years. Therefore, we should overcome the mentality of getting old before our time.

Four Types of People
Four types of people in ancient times who knew the ways of preserving health.
1. Real person
2. Complete person
3. Sage
4. Virtuous person
Learn more about the theory of Chinese medicine, please read Moving Styles of Qi.