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The low point is referred to as diastole and occurs when the ventricles relax and minimal pressure is exerted against the vessel wall. A normal blood pressure for a healthy adult ranges from 90 to 120 mm Hg systolic and from 60 to 80 mm Hg diastolic. Under normal circumstances, blood volume remains constant at 5,000 mL.
Blood Pressure Ranges Chart. As you age, your blood vessels become more rigid, and it's not uncommon for your systolic pressure (the top number) to increase. Although a reading of 120/80 is considered textbook normal, someone over age 40 can have a 140/90 reading and it can be considered perfectly acceptable.urrently the textbook definition of normal blood pressure is 120/80 mmHg. But the definition of normal has changed over the years. At one time, it was believed that normal systolic blood pressure was 100 plus your age. In the 1970s, intervention wasn't even recommended until pressures exceeded 165/95.