Normal blood pressure is 120/80 or lower, no matter what age. Determining is someones blood pressure high or not (does it require therapy or not or just diet changes), depends of many factors such as: age, body mass index, physical activity, smoker/non smoker, sex, etc..

The normal blood pressure for an adult is 120/80, often read as '120 over 80'. If your systolic blood pressure (the higher number) is over 125 or 130, or your diastolic pressure (the lower number) is over 85, then you should see a doctor to evaluate your blood pressure along with your medical history and overall health.

The risks of 'slightly high blood pressure' are greater than we used to think, and treating mild high blood pressure is a great way to reduce your risk of heart disease. Many years ago, good blood pressure was considered 125/85. Today, an ideal blood pressure is probably 110/70.

Low blood pressure (hypotension) is when blood pressure regular drops below 90/60. Although high blood pressure often has no symptoms at all (although heart disease increases during that time), low blood pressure often causes dizzyness or fainting.