User blog comment:RennaGraceCarter/Chapter 327 My Part Too - Review/@comment-7418318-20130414064845/@comment-7999338-20130414154828

Maybe the runes considered the age of the Dragon Slayer Magic not the biological age of Natsu and Gajeel. As we all know, Dragon Slayer Magic existed 400 years ago. :) - My opinion. :3