In old age arteries carrying blood in the human body become narrow resulting in an increase in the blood pressure. This follows from

In old age arteries carrying blood when there in narrow arteries pressure is pressure difference thus created will provide increased. Actually, due to narrowness and the necessary centripetal force for the water other obstruction the velocity of the flow body to rotate around the vertical axis. of blood gets decreased. This results in increased pressure inside the blood vessel, this must be equal to the pressure of water according to Bernoulli's principle.