The normal value of diastolic blood pressure is 60-80mmHg, while 80-89mmHg is the normal high value of diastolic blood pressure, but the elderly may experience a drop in diastolic blood pressure. Blood pressure is categorized into systolic and diastolic, and diastolic blood pressure is usually between 60 and 80 mmHg, but may exceed this range in cases of hypertension. Diastolic blood pressure of 80-89mmHg is not considered high blood pressure, but is normally high. In addition, the elderly may experience vascular sclerosis, resulting in an increase in the pulse pressure difference, which may cause a decrease in diastolic blood pressure, or even the elderly may exhibit a high systolic blood pressure and a diastolic blood pressure of less than 60mmHg. Therefore, both high diastolic blood pressure and low diastolic blood pressure are abnormal and require prompt medical attention for further evaluation of the condition and targeted treatment. In the case of low diastolic blood pressure, it is necessary to monitor blood lipids, blood glucose and other relevant indicators to assess whether there are high risk factors for vascular sclerosis, and timely treatment. It is recommended to take medication under the guidance of a physician.