Male reproductive years are not capped.
There is a saying you are familiar with: Rhapsody in July is a flower, and women are forty bean curd dregs. Female friends are definitely uncomfortable, but if you mean reproductive ability, that really makes sense. You must be persuaded. The secret is that women have a strict reproductive biological clock. Once you are over 35 or 40 years old, not only will your fertility decline, but the risk of giving birth to a defective fetus (such as congenital stupidity) will also increase, which is caused by the mutation of chromosomes with age. As for over 50 years old, menstruation has stopped, ovulation has stopped, and it has become an iron fact that there is no chance to have children.
What about men? It's just another "landscape", and it's less likely that fertility will be restricted by age. Have you found that in life, news about having a baby at the age of 90 or even 100 has been heard from time to time? It has long been recorded in China ancient books that "an 80-year-old man gives birth to a child", and there are living examples in modern times. For example, a birthday girl in Guangxi who is nearly 90 years old wanted to be a father 20 years ago. It is also very common abroad. For example, an old man in Sweden lived 120 years old, remarried at the age of 85, and gave birth to eight children. In the former Soviet Union, there was a farmer named Ahanher Buchana who got married and gave birth at the age of 1 12, which is probably the Guinness Book of Records for the birth of the oldest man in the world.
It is not difficult to understand that there is no upper limit for a man's reproductive years. Is there a scientific basis? Experts in Munich, Germany, respectively took 20 elderly people aged 60-89 and 20 young people aged 24-33 as the observation objects, tested their semen and compared them. The results showed that the sperm of old men did not age, and the sperm density (654.38+200 million per milliliter of semen) was higher than that of young men (only 78 million per milliliter of semen). It doesn't seem too much to describe the fertility of elderly men by being old and strong. Men also have a reproductive biological clock.
Although the reproductive life span of men is much longer than that of women, it is almost a lifetime, but from the perspective of eugenics, there is still the best age. Take sperm quality as an example. Although the sperm of elderly men are not aging and have a high density, their mobility is obviously reduced. The number of spermatium and abnormal sperm increased by 20%, and the speed of sperm metabolism also decreased. After metabolism, a lot of waste has been produced, and the adverse effects on future generations can be imagined.
In addition, after the age of 35, the androgen in the body also began to decline, and the secretion of testosterone decreased by 1% every year. Therefore, men, like women, have reproductive biological clocks, but men's reproductive biological clocks are more flexible.
According to the law of male reproductive biological clock, when is the most suitable time for a man to be a father? A French professor named Sheroz surveyed 2000 soldiers in that country and found that children whose fathers were born between 30 and 35 scored the highest in intelligence tests. He concluded that 30-35-year-old men have the strongest sperm vitality and are most suitable for childbearing.
This statement was verified by French geneticist Maurice. Morris's research shows that fathers between 30 and 35 have the best children. The explanation is that the sperm quality of men reaches its peak at the age of 30, and then lasts for 5 years until the age of 35, after which the quality declines.
Bi Hua, an American obstetrician and gynecologist, also thinks that a man in his thirties is the "best father". Because men in this period, in addition to physical advantages, have the characteristics of stable occupation, good economic situation and superior conditions for raising children.
Let's give a realistic example. You know, Margaret Thatcher, who was re-elected as the British Prime Minister for three times, was born in the home of a grocery store owner in Britain. How old was the grocer who gave birth to her? 32 years old, just in the best reproductive age for men!