What is the probablity of a 14 year old male having a heart attack?

Chances of MI: If by heart attack you mean myocardial infarction (dead heart muscle caused by blocked coronary artery), then the chances are quite low at that age in the absence of congenital heart disease or a metabolic disorder.

Very low!: Congemital anomalies can happen aortic root, aortic valvular disease aberrant coronary anomalous coronary origin but as another has noted: Cocaine and other drugs of abuse are more likely.

Depends: If the kid has progeria,(premature aging syndrome) that might be expected. If not, little to none.Most with chest pain have gastrointestinal reflux with heartburn.