Hypertension can affect anyone. Hypertension do not affect aged and obese people.
These days we can see hypertension even in very young people. Hypertension is not based on human race. The same it do not have any age barriers too.
When you heard something like a fit person died of heart attack due to hypertension, this this would have taken you by shock. On other hand you will see people who are plump and out of shape, but these people will have normal blood pressure. No one can say whether these kind of people will get hypertension and these kind of people will not get hypertension.
Every one should always check their blood pressure numbers correctly as this disease is called silent killer.
Blood pressure numbers depend mostly on the circumstances it is taken. Your blood pressure cannot be determined by single reading. When you see a rise in blood pressure, there is actually a lot of things to remember before hitting the panic button.
The same thing will happen with stress. When you have a tiring day at work, you will have a high blood pressure. When you have some pain that will rise the blood pressure number. So it is not appropriate to check your blood pressure numbers when you have any pain.