The specific life expectancy of diabetic patients does not have a fixed value, 40-year-old diabetic patients in general life expectancy and blood glucose control, complications and other factors related to the life expectancy of some patients after standardized treatment is no different from normal people. The life expectancy of diabetic patients often has a large gap, if they can effectively control blood glucose through lifestyle intervention, their life expectancy is no different from normal people; however, when blood glucose control is poor and various complications occur, their life expectancy will be shortened to varying degrees. the general life expectancy of 40-year-old diabetic patients is naturally also closely related to blood glucose control, and does not have a specific numerical value. Death in diabetes is often caused by a variety of serious complications, and the development of these complications is generally related to blood glucose control. Although there is no cure for diabetes, good glycemic control can be achieved through lifestyle management and medication. Patients suffering from diabetes are advised to visit a hospital in time to choose the best treatment plan for their condition.