Faced with the heavy pressure of "child slaves" and the eager gaze of previous generations of parents, more and more post 80s and post 90s generations have entered the baby boom. It has become a consensus that women have the best reproductive age before the age of 30, but what is the best reproductive age for men? 25 years old? 30 years old? 35 years old?
"As one of the important indicators of male fertility, sperm quality has always been the focus of young couples." Good birth and good breeding, starting from the seeds! "! At what age do men have the highest sperm quality?
The golden reproductive age for men aged 30
Men's growth and development are relatively late compared to women's, their sexual maturity is delayed, and their physical strength and experience reach their peak relatively late. Generally speaking, women aged 23-30 years are the golden age for fertility. During this period, the number and quality of female eggs are much higher, so at which age will the quality of male sperm reach its peak?
According to relatively independent surveys in several countries such as the United States and Switzerland, sperm quality in men will reach its peak around the age of 30. At this time, men are also relatively rich in physical strength, energy, and life experience. The quality of genetic information contained in sperm is the most superior, and their activity is the strongest.
The report points out that 30 to 35 years of age is the best childbearing age for men, because men in this age group are in their prime of life. In addition to the internal advantage of excellent physical fitness, other external advantages, such as economic and career stability, superior material conditions for raising children, and mature psychological endurance, are also important. Although a man has the ability to be a father throughout his lifetime, from the perspective of eugenics, it is better not to be over 35 years old. The sperm quality of men reaches its peak at the age of 30, then continues for 5 years until the age of 35, and then decreases.
Although men have developed to the age of 25, their sperm has not reached a peak at this stage. Physical strength, experience, and social experience are at an early stage, and the DNA information contained in the sperm is not perfect. Therefore, the younger the sperm, the better.
Sperm quality plummets after age 35
American scientists have discovered that the age of 35 is a watershed in the quality of male sperm. "The rate of genetic mutations in sperm significantly increases in men over this age group, and this finding may be the best explanation for the plummeting fertility rate of men over the age of 35.". Previously, it was widely believed that professional women who were overly focused on their careers were likely to sacrifice their ability to be mothers, as the quality of female eggs gradually declined with age.
However, a molecular study conducted by researchers at the University of Washington in Seattle in the United States also shows that professional men who intend to pass on their children should also worry about age issues. Men over the age of 35 will be less likely to have children.
The study was conducted by scientist Narendra? Initiated by Singh, the research team conducted a follow-up study on the semen of 60 volunteers aged between 22 and 60. These men were all healthy and had a normal sperm count in their semen. Singh found that although the number of sperm in men of different ages is roughly the same, their genetic quality is closely related to their age, and the age of 35 is a key dividing line. Molecular assays of older men's semen have shown that the concentration of DNA double helix damage in their sperm is relatively high, and the probability of genetic damage is also higher. Moreover, the immune system function of sperm is also relatively low, making it difficult to use the self elimination mechanism to eliminate defective sperm.
In addition, the activity of spermatozoa in the semen of older men is also relatively weak. Of course, the scientist who led the study pointed out that this finding does not mean that men over the age of 35 have a difficult chance of becoming fathers, especially if their partner is relatively young, they can still fulfill their father's wishes. In fact, statistics do not support this conclusion. For example, in the 1990s, the proportion of men over the age of 40 who became fathers in Britain increased by half, while in 1999, about 10% of newborn babies had fathers over the age of 40. Therefore, Singh emphasized that this latest study actually opens up a new perspective for exploring infertility in older couples.
What "things" are declining for men after the age of 35
"The quality of sperm decreases after the age of 35: Although sperm in elderly men do not age and have a higher density, their activity has shown a significant decline. The number of immobile and deformed sperm has increased by 20%, and the speed of sperm metabolism has also decreased. After metabolism, many wastes are also produced, with predictable adverse effects on offspring.".
As men age, their sperm, like eggs, not only have genetic problems, but their ability to conceive eggs is also greatly reduced. The older a man is, the worse his sperm quality is, and the more genetic variation he has, the greater the likelihood of causing disasters and diseases.
Sexual hormone decay after the age of 35: After the age of 35, male hormones in men also begin to decay, with an average decrease in testosterone secretion of 1% every year. Therefore, like women, men also have a reproductive biological clock, except that their reproductive biological clock is more elastic.
High mental pressure after the age of 35: Men aged 35 tend to have achieved little in their work, which also means that they have to withstand greater pressure and a more complex workplace environment, while increased work entertainment also means that they often need to be exposed to alcohol and tobacco. High levels of stress, nervousness, smoking, and alcohol consumption can interfere with sperm development and quality. Whether it is abnormal changes around the sperm or small changes in the sperm itself, it can lead to failure in eugenics, infertility, birth defects, and even miscarriage, stillbirth, premature birth, stillbirth, as well as various congenital abnormalities or malformations of different nature and types.
The younger a man is, the poorer the quality of sperm produced. At 25 years of age, sperm is basically fully mature. At around 30 years of age, sperm produced has the highest quality and strongest vitality, and can pass on the best genes to the next generation. However, too old a man's childbearing age is also unfavorable, and the incidence rate of congenital malformations and genetic diseases in the children born is also high. Genetic eugenists believe that if a husband and wife are 2-3 years older than a woman, and the male is around 30 years old, that is, the female is around 27 years old, both parties are based on the optimal reproductive age.