Yes, congenital defects. His first heart attack came at 31, he went on to have several more heart attacks. From his Wikipedia entry: At age 31, Bogle suffered

Yes, congenital defects. His first heart attack came at 31, he went on to have several more heart attacks. From his Wikipedia entry: At age 31, Bogle suffered from his first of several heart attacks, and at age 38, he was diagnosed with the rare heart disease arrhythmogenic right ventricular dysplasia. He received a heart transplant in 1996 at age 65.[13][14] https://en.wikipedia.org/wiki/John_C._Bogle#Personal_life https://en.wikipedia.org/wiki/John_C._Bogle#Personal_life