What is the least reported age for a person to get heart attack?

Coronary artery Disease (CAD) is one of the commonest ailments in developed as well as developing world. Obesity, sedentary lifestyle are it's causes.. I have heard that youngsters also suffer from heart attacks.. Can some one tell me the least reported age for MI (Myocardial infarction) or heart attack.. Can you tell me with examples... Thank you,,,