User blog comment:IamJakuhoRaikoben/Chapter 327: My Part Too, Review./@comment-5113042-20130413152152/@comment-203.87.152.6-20130413181926

Well maybe Dragon Slayer Magic was originated 400 years ago from the dragons ofcourse. And igneel, grandine, metallicana, and other dragons lived 400 years ago. So they taught that to Natsu, Gajeel, and Wendy. So the magic's age was transfered to them. And Fried's runes were ancient. I think it counted the age of Natsu and Gajeel's magic rather than their biological age.