Hi enlarged heart is medically termed as congestive cardiac failure , most likely this condition starts after 45 years of age but such early onset of chf can be because of congenital heart disease, ther are three types of disorders\ atrial septal deffect ventricular septal defect patent ductus arteriosus. 2 d echo must be done in detail to see the locaton size and anomaly in the heart,once the defect is identified it can be treated medically or corrected surgically. medical treament depends on nature and size of defect , ont do any life style modification till echo is done