My blood pressure is 140/80 and has been that way since I think I was 18... I'm 24 now.
My doctor wanted to put me on blood pressure medication but I refuse to do so for a few reasons. One, I don't want to form a psychological dependence on a pill because I'll never get around to treating the root cause. Second, the cause of my high blood pressure is, in all likelihood, mental. My sodium levels are fine and I even went low-sodium for a while... zero change. When I take in to account my addiction to caffeine, simple sugars, and other stimulants, I have come to realize that I have a natural low-level amount of basal stimulation, which was evident all my life.
So, my theory is that in order to function through out the day with little stimulation, I cause myself unneeded anxiety. Others have noticed that... I don't know how to relax and I easily get irritated or pissed off. I can easily become addicted to working 70+ hours a week or playing video games for just as long.
Interestingly (or at least to me), the lowest heart rated I recorded for myself was 57 BPM with blood pressure at 138/80. The lowest diastolic BP I had was 70 or so. Systolic BP stays the same always.