I read your question carefully and I understand your concern.High blood pressure
is a very common problem with age increasing. Approximately 50% of people have essential hypertension
(meaning without a primary treatable cause) after the age of 60, so you shouldn't be surprised of these new developments although you are apparently healthy.
High blood pressure is indeed a major risk factor both for heart attack
and for stroke
. However it's more of a long term risk, related to added stress on blood vessels over the months or years. So if you want to give it one more month to try non medical measures I think it's fine, although I think with those repeated measurements lifestyle changes won't be enough and medication will be eventually started. Don't postpone it anymore though.
What I said though applies to those measures you mentioned meaning under 160/90. If you have higher values or signs like headache, vomiting
then I think you should start treatment right away because very high values could go over your body compensation threshold and have immediate repercussions.
Hope things work out for the best.