The average age of a student pilot is 34 years old. Many don't start until retirement and we have trained student pilots as old as 76 years young!
Subpart D - Third-Class Airman Medical Certificate § 67.303 Eye.
For many people, simply achieving an appropriate weight, exercising regularly, and watching dietary salt will control their mild hypertension. Other individuals may be required to take medications to reduce their blood pressure. Either way, hypertension and its treatment should have little effect on one’s ability to be medically certified to fly.
If an individual with no known history of hypertension is found during the FAA exam to have blood pressure readings consistently higher than 155/95 then further investigation is required. Initially, this should consist of recording the blood pressure twice a day (morning and evening) for three consecutive days. If at least 4 of these 6 readings are 155/95 or less and the applicant is otherwise qualified, then no further action is required and the certificate can be issued. If the three-day blood pressure checks confirm the presence of hypertension, then treatment of some kind will generally be required for certification. Once a person is on a stable treatment plan and their blood pressure is adequately controlled without significant adverse effects, certification can be considered.