The life expectancy of a 57-year-old type 2 diabetic is not fixed; if blood glucose is well controlled and no diabetic complications occur, life expectancy is largely unaffected; if blood glucose is not aggressively controlled and acute or chronic diabetic complications occur, life expectancy may be only a few years. Type 2 diabetes is a chronic disease that cannot be cured and requires lifelong treatment. The life expectancy of a diabetic patient has a great deal to do with the patient’s compliance. If detected early and treated early, with strict glycemic control, it basically has no impact on life expectancy. If it is not detected at an early stage, or not actively treated, poor long-term glycemic control may lead to the emergence of various chronic complications, such as diabetic nephropathy, diabetic foot, etc., which may be life-threatening if not treated in a timely manner. There is also the possibility of acute complications, such as diabetic ketoacidosis, diabetic hyperosmolar hyperglycemic syndrome, the condition is critical, can be life-threatening. Therefore, diabetic patients should actively follow the doctor’s instructions to control blood glucose and delay the development of diabetic complications.