Typically, normal blood pressure is less than 120 mmHg (millimeters of mercury) systolic (the first number) and less than 80 mmHg diastolic (the second number). (i.e. Less than 120 over 80).
Above those numbers is considered hypertension However, when it is too low, it might be a problem. See for detail and symptoms here: americanheart.org/presenter.jhtml?identi... These "norms" are typically the same for different age levels, but they can differ for some individuals, especially on the low end, - as some people may have their normal pressure relatively low.
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