User blog comment:Sargenttacos115/Natsu and Gajeel age Theory/@comment-124.171.139.160-20130916123736/@comment-7418318-20130916124822

Gajeel's and Natsu's counterparts were both at the same age as the Dragon Slayers, so the age difference between the two Wendy's has nothing to do with one being a Dragon Slayer.