User blog comment:Redheadedpichu/Wendy's age/@comment-5894890-20141013175025

As the people below stated, they didn't age at all during the 7 year gap. Info from the author says she's 12... so I don't know where your getting all these numbers of her being 14 etc lol. Well, there's no specific age for them to be a mage, it's just the time they take to learn magic etc. Also, you can look at Erza, Natsu, Lisanna etc, they were already considered mages at a very young age. (As Lucy said: "mages won't be considered full-fledged until they work for a guild".)