At what age do you start believing your pains might be symptoms?

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I was reading a list of possible symptoms of a heart attack. When you are young, you automatically think it doesn't apply to you, but at some point it does. They include: 1:Chest discomfort, pain or discomfort in arms, back, neck,jaw or stomach. 2: Shortness of breath 3: Cold sweat, nausea, vomiting or lightheadedness. Then they advise you not to wait longer than five minutes before calling for help. If I called an emergency number every time I had pain in my arm, jaw, back or neck I might as well live at the hospital.