A blood pressure rating of 120/80 is a normal blood pressure reading for someone 70 or above and for anyone below age 70 of age.
If your blood pressure gets above 120/80 then it's getting high and you're getting into pre hypertension and should do what you can to lower the blood pressure to normal again.
Drinking water and apple cider vinegar seems to help lower my blood pressure when it gets high and also avoiding stress.