A blood pressure level of 140/90 mmHg or higher is considered high. Most people over age 65 have high blood pressure.
If your blood pressure is between 120/80 mmHg and 139/89 mmHg, then you are considered to be in the "prehypertension" category. This means that you don't have high blood pressure, or hypertension, now but you are more likely to develop it in the future.
You can take steps to prevent high blood pressure by adopting a healthier lifestyle that includes weight loss through improved eating habits and regular exercise.