User blog comment:Sargenttacos115/Natsu and Gajeel age Theory/@comment-24956965-20140513122821/@comment-4820738-20140519105407

Sting, Rouge, and Wendy are Technically the same age they were all 12 before the time skip, so It seems like Those 3 are the Dragon slayers of this time and Natsu and Gajeel are from another Time.