From a genetic point of view, the best age for a man’s sperm quality is between 20 and 30 years old. Because the health level of sperm and the man’s own health has a huge relationship, as age increases, sperm damage will also increase, the worse the quality of sperm will be. A large number of statistical results show that there are two major factors that affect the quality of sperm when you get older, as follows: First, external factors, such as external infections, like inflammation of the reproductive organs, such as epididymitis, vesiculitis, cold, viral invasion, as well as staying up late, drinking alcohol and mental tension, work pressure, decline in living conditions, sperm quality caused by internal diseases. Second, the irreversible aging of humans, after the age of 30 men’s sperm plasma mutation, sperm production, metabolic abnormalities, from the genetic point of view of chromosomal defects are increasing, these will let the quality of sperm decline, causing infertility. The Chinese medicine’s internal meridian also says that men’s three eight kidney energy average, tendons and bones strong, this is the ancient people from the life of the observation, men between 20-30 years old in the best physical condition. So the best age for men to have children is 20-30 years old, 35 years old will be a precipitous decline, this time the chances of infertility will increase significantly.