It may or may not be normal for a 55 year old to have his period for 40 days. 55-year-old patients may have prolonged menstruation, menstrual drenching symptoms, which is related to menopausal syndrome, due to the body’s hormone secretion disorders, which may lead to menstrual dysfunction, the appearance of this symptom, may be a normal reaction. Prolonged menstruation in some patients may also be related to diseases, such as endometrial polyps, cervical fibroids, endometrial cancer, cervical cancer and other diseases may also lead to bleeding symptoms, which is not normal. You need to observe your menstrual period more often, and if there are any abnormal symptoms, we recommend you to consult a doctor in time.