User blog comment:Sargenttacos115/Natsu and Gajeel age Theory/@comment-24.46.16.152-20140216144648/@comment-7418318-20140308161242

Other guild cards have mentioned facts that the featured character would never mention to anyone else (like how Jenny secretly liked the nude photo-shooting), so I think we can take what is on the guild cards as literal knowledge directly from Mashima, rather than biased information coming from the character itself.