At that time, the status quo was "men are outside, women are inside." Most men are engaged in heavy manual labor, coupled with poor living conditions, unable to keep up with nutrition, and the constant consumption of physical strength, men are overwhelmed; Besides, get married early. There is a way, that is, before the age of 32, when a man is the strongest, it is the best time to have children. Once you miss this "golden period" of childbirth, the children you cultivate are more or less inferior to others. In people's consciousness, it is better to have children earlier, get married earlier and recover faster. Based on the fact that the average age of the ancients was not long, especially after the age of 64, the functions of men's bodies in all aspects have begun to deteriorate, and their reproductive ability has also greatly declined, so it is still necessary to "do what you can."
There are differences in physical development between women and men, and women age earlier than men. According to the current medical point of view, a woman is 49 years old, approaching menopause, about to amenorrhea, and cannot get pregnant; Moreover, with the increase of age, the body function begins to deteriorate, and the pelvic anatomy will also undergo qualitative changes. In addition, the delivery technology is very backward, and the risk of giving birth is very high. I also understand the reasons why the ancients generally married early.
This shows that the ancients were still very wise. The statement that "men are only eight or eight, and women are only seven or eight" is very reasonable at least under the living conditions and medical conditions at that time. However, this seems to be a bit contradictory to the late marriage and late childbearing advocated now, but it is still necessary to grasp the best opportunity for men and women to have children. This is probably the reason why "older" women are reluctant to have a second child!