Hi C-Jay, Do you know how long your dad has known about his high blood pressure? Sometimes blood pressure rises when a person gets nervous or excited about something (being in the doctor's office, etc.), and then it goes down. Blood pressure goes up and down all the time. Did his doctor recommend that your dad take medicine for his high blood pressure? I take blood pressure pills and have taken them for many years. I also try to walk a lot, stay calm, and be sure I eat a healthy diet. His doctor should be the one to tell your dad whether or not he should be taking medicine to help lower his blood pressure. Blood pressure pills have been around for years and have helped many people, so you shouldn't worry if his doctor wants him to take pills to lower it. Good luck!
Does your dad smoke? If so, he should definitely stop, even though it's difficult, because that can cause blood pressure to rise plus many other diseases. Does he drink a lot of alcoholic drinks? Does he exercise - walk, run, do weight lifting, etc.? I think that if you search on the internet, you could find out about ways to help lower blood pressure. Diet is very important. Is his cholesterol high? Surely his doctor could advise him without charge, since he has already talked to him to learn he has high blood pressure. If not, the nurse at the office could. Do you know what his blood pressure reading is?? If the pills are necessary, then he really should figure out a way to pay for them - the generic ones aren't that expensive.
Also, watch sodium intake and his weight. Those can also raise the blood pressure along with smoking and drinking. Old age can be a factor too.
My grandma is 90 and she just went on bp pills 5 years ago and her diet, weight and etc are fine. Heredity can also play a big factor and you can't do much about that.