Normal blood glucose values for 50 to 70 years old, measured fasting blood glucose is 3.9~6.1mmol/L, 2 hours after meal blood glucose does not exceed 7.8mmol/L. Regardless of age, the diagnostic criteria for diabetes remain unchanged, with fasting blood glucose of 3.9 to 6.1 mmol/L and 2-hour postprandial blood glucose of no more than 7.8 mmol/L. Based on the measured value of blood glucose as well as the clinical symptoms, it is possible to determine whether or not the organism is suffering from diabetes. Fasting blood glucose greater than or equal to 7.0mmol/L, glucose tolerance screening two hours of blood glucose greater than or equal to 11.1mmol/L, or any time the venous blood glucose is greater than or equal to 11.1mmol/L, which meets one of the three, coupled with excessive drinking, urination, polyphagia, weight loss and other clinical symptoms, can be diagnosed as diabetes mellitus. Elderly people over the age of 50 should usually do a good job of physical health checks, if you find abnormal blood sugar, please consult the hospital in time to avoid delays in the condition.