The 64-year-old man sex life hard not up may be with the age reason, but also may be psychological factors and so on. 1. Physiological reasons: men will with age, sexual function decline, this is because people in the process of gradual aging, due to their own degenerative changes, can lead to a decline in the function of the whole organism, sexual function is no exception, so middle-aged and elderly men sex life is difficult to avoid the phenomenon of not erectile. 2. Psychological factors: patients due to tension, anxiety or tension in the relationship between husband and wife, emotional changes in sexual life lead to the contraction of the arteries supplying blood to the penis, there is a lack of blood supply to the penis, the cavernous body can not be engorged, distended, and thus unable to achieve and maintain sufficient erection, unable to complete a satisfactory sex life. If symptoms such as erectile dysfunction occur, it is recommended that the patient consult a doctor in a timely manner so that the doctor can clarify the cause of the disease and give targeted treatment.