User blog comment:FairyRaven/Fairy Tail Chapter 400: Wings of Hope, Review and Commentary/@comment-188.171.26.251-20140913134612/@comment-76.124.155.27-20140913141937

that would explain why no1 has seen dragons or dragon slayers before natsu and co. emerged. It was most likely to hide them from acnologia and would also explain why at least natsu and gajeel are over 100yrs old as seen in the war of fairies arc