User blog comment:LastationLover5000/Is Natsu Acnologia?/@comment-89.110.238.198-20131006143358

I read an intersting theory: and it's that all the 3 dragon slayers (Natsu,Gajeel and Wendy) came from 400 years of the past. So the dragons didn't disappear, the kids were sent to future somehow. This would explain how Freed's "over 80 years old" barrier blocked them, and how Zeref knows Natsu. Also the dragons disappered same day as the eclipse gate was working, and Natsu's birthday and age are unknown. It's very possible. But it's just a theory.