During the Battle of Fairy Tail, Laxus had his much neglected boyfriend put a Rune Spell around the Fairy Tail Guild Building; that made it so that those who were: Over the age of 80; or a statue could not cross leave the Guild Hall for Magnolia. This resulted in both Natsu and Gajeel for some inexplicable reason not being able to leave the building until after Levy (soon to be a Gajeel fan-girl who strangles kitties while fan-girling:). Seeing as how I've noticed a few people bringing this up recently; I decided to ask a few of my friends for their thoughts on this. And one of my friends put forth this particular one that is a tad different that most of the ones I've seen recently, and it also has some merits which I will point out. The theory I have to present is this: The reason that Natsu and Gajeel could not pass through the barrier is the age of their Magic. What is reasoned here is that Freed's age barrier works by using the age of the persons Magic as a means to measure that individual's age. The fact that Dragon Slayer Magic is a Lost and Ancient Magic one typically learns from Dragons; it can be reasoned that when a Dragon teaches this Magic to a human, they have to give them a bit of their own Magic Power in order for the person to use it. This was reasoned because Dragon Slayer Magic gives parts of the user's body properties to a Dragon, which could easily be done (in theory); by the Dragon imparting a part of their Magic Power to the human. Since Dragon's are typically said to live extraordinarily long life-spans, then their Magic Power could feasibly be older than 80 years old. And if they (the Dragons) give a small bit of their Magic Power to a human; then that human's Magic Power is (potentially) also aged as they continue to use the Magic. Seeing as how the exact methods through which one learns Dragon Slayer Magic are still rather obscure; this can leave this (admittedly unorthadox) theory open to consideration. All in all those above points seemed to make a bit of sense logically to me. But anyone else's opinions and feedback (but not trolling) is welcome.