The normal systolic blood pressure range for a 40 year old blood pressure is 90 to 139 mmHg and the normal range for diastolic blood pressure is 60 to 89 mmHg. Blood pressure is the pressure on the walls of blood vessels when blood flows through them, including systolic and diastolic pressure, and it is one of the most important indicators of the organism. Many factors can cause blood pressure fluctuation. Therefore, the body’s blood pressure is fluctuating, not static. The normal range of systolic blood pressure for a normal forty-year-old person in a quiet state is 90~139mmHg, and the normal range of diastolic blood pressure is 60~89mmHg. However, for example, strenuous exercise, emotional excitement, and staying up all night will cause a temporary increase in blood pressure, and after eliminating these physiological factors, the blood pressure will revert back to the normal range, which is also normal. If the blood pressure is too high or too low, you need to go to the hospital at the first time. Under the guidance of the doctor to standardize the treatment, so as not to delay the condition.