The time when male sexual function starts to diminish cannot be generalized and needs to be further analyzed according to each individual’s physique and health condition. Healthy men will gradually decline in sexual function as they age. Generally, men around 40-50 years old may experience varying degrees of sexual decline with changes in hormone secretion in their bodies, including desire, erectile function and ejaculation, which may not be very obvious. But for men who usually work under high pressure, depressed for a long time, or suffer from chronic diseases, the age at which sexual function begins to decline may also be correspondingly early. In addition, it is recommended that middle-aged men in the usual healthy diet and rest habits, avoid eating greasy, spicy food, less smoking and drinking, less late at night; at the same time to maintain appropriate physical exercise, such as regular running, squatting, push-ups, etc., to a certain extent, can delay the decline in sexual function.