Is cardio a part of your work out regimen? Get a mountain bike, best thing I ever did for my health, I used to hate cardio.
Do you eat a lot of red meat? I'm down to once or twice a week, moderation in red meats help.
How heavily do you drink? Boozing a lot is bad for your blood pressure as well as other areas of your life. Moderation once again is the key, unless you have addiction issues of course, then abstinence is the best course of action.
You don't smoke do you?
I'm a Christian, I believe and trust in Christ. When I'm not living consistent with what I know and believe is right I experience stress.
Self examination and knowing yourself, what you believe, your ethics, is crucial. That way you can identify when you aren't living up to the standards you believe you should be, causing yourself undue stress.
My Grandfather died after his third heart attack, before he reached seventy. My father struggles with high blood pressure problems and is on serious meds. Still drinks and smokes.
At 45 my blood pressure is consistently 120/80 or better every time I go to the doc.