PJ-296 Percutaneous Coronary Intervention for Acute Myocardial Infarction in the Elderly : Comparison on Clinical Outcome between Younger Patients, Septuagenarians and Octogenarians(Acute myocardial infarction, clinical (diagnosis/treatment)-8 (IHD) PJ50,Poster Session (Japanese),The 70th Anniversary Annual Scientific Meeting of the Japanese Circulation Society)