There is no exact standard for how old a man is when his sexual function diminishes. Most men lose their sexual function around the age of 45~50 years old, and the exact time depends on each person’s physique and health condition. In most cases, men will start to decline gradually from about 45~50 years old. With age, the male body androgen secretion decreases, which will lead to the decline of sexual function. If the patient is usually weak or suffers from chronic diseases such as high blood pressure or heart disease, the age at which sexual function begins to decline may also be advanced accordingly. It is recommended that men in their normal life to develop good habits of work and rest, try to avoid staying up late. Avoid spicy, greasy, cold and other foods in your diet. At the same time to maintain appropriate physical exercise, such as regular running, squatting, etc., through these habits to slow down the decline of sexual function. Men should abstain from sex in daily life, and pay attention to physiological hygiene, moderate physical exercise, help to maintain sexual function.