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Once you have your average blood pressure, the next step is to see where the numbers fall. Generally, anything under 120/80 is considered a good blood pressure. Average numbers between 120/80 and 139/89 are considered prehypertension.. If the average of your numbers is more than 140/90, you have high blood pressure.
These values for the 10-12 years age group are 114-127 (systolic) and 77-83 (diastolic). Normal Blood Pressure Range for Adults. The normal blood pressure for adults needs to be less than 120 mmHg in the systole phase while the value for the blood pressure in the diastolic phase should be less than 80 mmHg.Normal Blood Pressure Range for Elderly. The values of ideal blood pressure change with age.hese values for the 10-12 years age group are 114-127 (systolic) and 77-83 (diastolic). Normal Blood Pressure Range for Adults. The normal blood pressure for adults needs to be less than 120 mmHg in the systole phase while the value for the blood pressure in the diastolic phase should be less than 80 mmHg.