Systolic pressure less than 90 mmHg and diastolic pressure less than 60 mmHg indicate low blood pressure.

The normal blood pressure range for adult males and females of any age is a systolic pressure between 90 to 139 mmHg and/or diastolic pressure between 60 to 89 mmHg. High blood pressure is defined as having a systolic pressure of 140 mmHg or higher and/or a diastolic pressure of 90 mmHg or higher. Arterial blood pressure varies among individuals, as well as by age and gender, with a general trend of increasing pressure as age advances, and the increase in systolic pressure is more pronounced than that in diastolic pressure. Before menopause, women tend to have slightly lower blood pressure than men of the same age, but after menopause, their blood pressure generally aligns with or even slightly exceeds that of their male counterparts.