The document discusses age-related changes that occur in the cardiovascular system. It begins by explaining the normal conduction of the heart's electrical impulse starting in the SA node. As people age, the conduction system slows down and the heart rate decreases. The walls of the heart also thicken as people age due to long-term pressure and volume overload on the heart. Blood vessels become stiffer and narrower due to deposits of fatty materials. Overall, the aging process has effects on the heart and blood vessels that can increase the risk of cardiovascular diseases.