What is the likelihood of a 23 year old girl having a heart attack?

Small: It is very unusual for people under 40 to have significant atherosclerotic disease. Young diabetics are sometimes seen below 40 with heart attacks.

Very low!: Congenital, 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 in your age group. If you are smoking, hypercholesterolemic, obese, diabetic you have increased risk work on the risk factirs youbave, .