As you age, your heart can’t beat as fast during exercise or when you’re stressed. As its walls get thicker and its valves get stiffer, blood may not flow through as efficiently. The heart’s electrical system may start to glitch, which can cause an irregular heartbeat. The most common problem is artery plaque buildup. But you can lower your risk of trouble with healthy habits, such as exercise, a heart-healthy diet, and not smoking.

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