Tracing back to the source, the original meaning of this sentence refers to the reproductive age of men and women. The Yellow Emperor asked Zeebe when they could have children at the latest. Zeebe's answer was that there were only eight or eight men and seven or seven women. That is to say, men are of childbearing age before the age of 64, and women are of childbearing age before the age of 49.

2. This sentence first came from China's famous medical classic Huangdi Neijing. Huangdi Neijing occupies a high historical position in Chinese medical classics, and records a large number of methods of health preservation and conditioning. Later, many medical works have the shadow of Huangdi Neijing, which is also the most famous medical ancient book in China.

3. Huangdi Neijing has a lot of discussions on the physical development of men and women, and the book has the view of "eight men and seven women". For men, the book says that "the husband is eight years old, full of kidney qi and teething", which means that the man is eight years old, full of kidney qi, and his hair and teeth begin to grow. At the peak of his life, he was 32 years old. The book says "four or eight years old, strong bones and muscles, full of strength", and at the age of 84, it says "eight or eight, no teeth". Men's growth cycle is an eight-year cycle, which is the turning point of eight years. It is a process from development to maturity and finally to aging. When people reach the age of 64, their teeth are getting worse and their hair is getting whiter and whiter. The phrase "a man is no more than 88" here is actually aimed at physical changes. Once you pass 8864, you will never be as experienced as usual.

The number 7 is for women. It is recorded in the book that "a woman is seven years old, full of kidney qi and has longer teeth". This means that when she was seven years old, all aspects of her body began to grow rapidly. One is manifested in the vigorous operation of kidney qi, and the other is manifested in the beginning of tooth and hair growth. At its peak, it was 4728 years old. The book says "477, strong bones and muscles, extremely long hair and strong body", but by the age of 49, the body began to decline. The book says that "the pulse is weak, the pulse is too weak, the day is tired, and the tunnel is impassable, so the shape is bad." As the saying goes, "Women are just July 7th", that is, seven years is a cycle. If she is over 77 or 49, her health will gradually decline.