To investigate the similarities and differences between older and younger patients with AMI Methods. From a databsse of 152 patients admitted to Thong Nhat hospital with acute MI between 2006 and 2009, we compared clinical characteristics of patients divided into 3 age categories: <45 years, 45 - 65 years, and >65 years. Risk factors, presenting symptoms, types of MI, types of coronary lesion and mortality rate of the 3 groups were evaluated Results.