why blood pressure (bp) increase in old age

In old age the elasticity of the Blood vessels decrease therefore the blood pressure rises.                       Also some times the accumulation of cholesterol in the arteries to become narrow . in such condition the heart pumps the blood with high pressure to supply the blood to all parts of the body this is also cause the blood pressure rises. in also those food and water can also increase the blood pressure that contain high amount of salts and minerals  .if the person wants to decrease the high bp , so he or she would be have an exercise.