Blood pressure may measured by the blood that presses against the walls of the arteries and blood vessels. For people who suffer from high blood pressure, this measurement may abnormally high. When blood pressure is high, the heart may work harder to pump an adequate amount of blood to all parts of the body. Although blood pressure may varies from person to person and also by age, in general terms, normal blood pressure should be less than 130 mm Hg systolic and less than 85 mm Hg diastolic. Optimal blood pressure is less than 120 mm Hg systolic and less than 80 mm Hg diastolic (120 over 80).