Link between elevated B/P and dementia

My blood pressure taken today is 126/68 and resting pulse rate is 69. I am happy with my BP and cannot ask for a better reading especially at my age.
According to the most recent study, a reading of 130 or more at age 50 (systolic or the above reading which is 126 in my case) may lead to dementia at around age 75.

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2 hours later after a 2 km walk and 30 mins rest I took my BP (below)