Background: Coronary Artery disease (CAD) is the leading cause of death globally. The classic presentation of worsening angina culminating acute coronary syndrome (ACS) is rare in younger patients but the first onset of angina that rapidly progresses to fully evolved myocardial infarction (MI) is oft   en the case. The aim of this work was to study the short term outcome in patients undergoing primary percutaneous coronary intervention for acute ST elevation myocardial infarction. Methods: This was study a prospective, cross-sectional study carried out between July2020 to July 2021. The patients underwent coronary angiography at the National Heart Institute and cardiology department of Benha university hospitals. The patients were classified into two groups: - Group1: comprised 100 patients with coronary artery disease (CAD) aged <45 years old. Group2: comprised 100 patients with CAD aged ≥45 years old. Results: The rate of success of primary intervention was comparable between the two study groups 95% in young group vs 90% in older group. Conclusion: Acute STEMI in young Egyptians was predominantly observed in men, MACE was less frequent in Young age group.