73 years old normal systolic blood pressure is between 90~139mmHg and diastolic blood pressure is between 60~89mmHg. If the systolic blood pressure is greater than or equal to 140mmHg and diastolic blood pressure is greater than or equal to 90mmHg, it is considered to be suffering from hypertension, and according to the severity of hypertension, it is also categorized into three levels, mild, moderate and severe hypertension. Hypertension is a relatively common clinical disease, which is a cardiovascular syndrome with elevated arterial pressure in the body circulation as the main clinical manifestation, and is divided into primary hypertension and secondary hypertension. Normal systolic blood pressure is between 90 and 139 mmHg, and diastolic blood pressure is between 60 and 89 mmHg. Hypertension is related to genetic, environmental and other factors, such as family history of hypertension, prolonged high oil and high salt diet, frequent smoking or excessive obesity, etc., are all prone to hypertension. It is recommended to measure blood pressure regularly to keep it within the normal range. If any abnormality occurs, you must go to the hospital in time.