Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Heart Diseases--Prevention ?
    ### Response:
    Heart disease is the leading cause of death in the U.S. It is also a major cause of disability. The risk of heart disease increases as you age. You have a greater risk of heart disease if you are a man over age 45 or a woman over age 55. You also are at greater risk if you have a close family member who had heart disease at an early age.
    