Best results are from readings during your normal daily life, so a home reader you buy yourself or a 24hr one a GP may give you. Readings in hospitals or at GP will typically be on the high side.
What’s a good measurement varies per person, but the guidelines above are typical. I think they go on the lower of the two readings but the two combined mean something also.
Anyway, if you live in the US, you’d be placed on drugs for pre-hypertension. That’s a condition that isn’t a condition. It’s a statistic that says Americans with values in that range will probably become fat and go on to full high blood pressure, therefore stick them on drugs and make lots of money 😉
In UK a GP would say “normal” and send you away.
I’d say just try to keep it bit lower but do regular checks to see how it’s behaving.
High blood pressure itself isn’t dangerous. It’s just other risk factors like heart disease and clogged arteries can trigger stuff when BP is high. That’s why salt is considered so evil. It’s fine in moderation for most people but it does raise BP a little and statistically that’s a risk for a fraction of the population so therefore ban it. Similar sugar at the moment because some lazy people get fat from it therefore all sugar is now evil.