As of June 2015, the normal blood pressure rate for men 50 years old and under is less than 120 over 80 millimeters of mercury, or less than 120 systolic and less than 80 diastolic, states the American Heart Association. Stress, exercise, posture or sleep can change one's blood pressure.
One elevated reading does not automatically mean a person has high blood pressure. However, when a person's readings are consistently at 140 over 90 millimeters of mercury, a physician may recommend a treatment program, notes the American Heart Association. Programs typically include changes in lifestyle and frequently include prescription medication for patients with readings of 140/90 and above.