How long an 80-year-old patient with prostate cancer can live is related to a variety of factors and cannot be determined. If detected early and treated well, he or she can survive for more than 5 years. Prostate cancer is an old age disease that generally develops slowly and has a long course. 80 year old prostate cancer patients are senior patients and are generally recommended to have endocrine therapy or radiotherapy to remove androgens from the male body, which can effectively inhibit the continued growth of prostate cancer. If prostate cancer is found to have spread and metastasized, chemotherapy can also be used after endocrine therapy is resistant. With the above treatment and medication, patients can generally survive for more than 5 years. The specific survival period needs to be analyzed in conjunction with the patient’s physical condition, tumor stage, treatment and medication, as well as the patient’s attitude and cooperation with treatment. Patients should maintain a calm and optimistic attitude, actively cooperate with treatment, eat more vegetables and fruits to reduce the occurrence of constipation, and family members should take care of elderly patients to create a positive convalescent atmosphere.