My grandmother had hbp, my dad has hbp and I have hbp. Both smoked, didn't exercise and did not eat healthy.
I've had it since I was 27 (now 35). I eat well, exercise, don't smoke etc.
My brother smokes, drinks and eats horribly and he does not have hbp.
My mom does not have hbp and she doesn't smoke, eats healthy and exercises.
I definitely believe mine is hereditary.
The one thing my dad and I have in common is how we react to stress. I'm still working on it.