Why do you need Moefi ? if you just want to go visit, you dont need it, you can go and stay in iran for 3 months in a year, if you want to live there, then yeah, you need what is called "Affe Rahbari" I believe they are at 1355 now. so if you were born on 1355 or before, you can apply, however these things keep changing, I strongly recommend calling embassy to be sure.