Our blood vessels get aged as we grow old; clear signs of its aging – atherosclerosis. The harder our arteries get, the more pressure of your blood will thus be formed in your body, which delivers lesser blood through your body, slowing down the metabolism, and speeding up the aging process. Your risk of cardiovascular diseases high will be just high if your BP rates measured over 120/80mmHg, meaning your vessels almost equivalent to those of the 50 years.
For people with BP values over 130/80mmHg, like the 60-70, that probably means that you might have cardiovascular diseases, chronic disease, and diabetes, etc. Also, it might mean that you have at least one type of choric disease if your BP over 140/90mmHg, or of the 75+ years old. And, it would be the best for the people with no symptoms to regularly take BP measurements. If your BP values are normal, you could take measurements once per year.
However, if your blood pressure gets unstable already, it would be the best to check your BP changes or the waveforms daily.
As for the BP measuring notes here, because of its changing every minute, you could take your BP measurements two times right after getting up in the morning and get average values for those two rates, and take 1-minlute interval break in between your BP re-measured, then begin the same procedure before bed for knowing your BP status of the day.
Please note that to obtain more precise values, it would be the most ideal when taking BP measurements sitting relaxed in quiet environment with your bare arm.
Normal BP rates: SYS <120mmHg; DIA < 80mmHg
Pre-hypertension: SYS 120-129mmHg; DIA 80 mmHg
Stage 1: SYS 130-139mmHg; DIA 80-89 mmHg
Stage 2: SYS ≧140mmHg: DIA≧90mmHg。
Source taken from: Heho健康https://heho.com.tw/archives/91074