Generally speaking, women will live five years longer than men. Studies have found that a man's heart will become weak with age, but when a healthy woman reaches 70 years old, her heart is still as full of vitality as when she was 20 years old. The decline of male heart strength is mainly due to the fact that with the increase of age, the cells that control the contraction of heart muscles will be greatly reduced. A 70-year-old person will have 1/3 fewer such cells than when he was 20 years old.