User blog comment:Sargenttacos115/Natsu and Gajeel age Theory/@comment-208.118.68.222-20130823132306/@comment-79.168.18.76-20131224101315

Wendy is just younger than natsu and gajeel, even in they're hypothetical original time. just because they all met dragons doesn't mean it was at the same time or at the same age... she was just born after natsu and gajeel, and when they were sent to the future they kept the same ages, assuming they were sent at the same time there is no reason to assume they'd be the same age