User blog comment:Sargenttacos115/Natsu and Gajeel age Theory/@comment-90.224.60.253-20140724160947

If Natsu isn't "around 20" then he must have earned these "extra" years before he joined Fairy tail. - Someone should have noticed he was gone or changed severely if it happened while he was part of the Guild. As it should have happend before he joined the guild then we should be able to narrow it down...