Quote from kahn
me thinks something big is gonna happen with Natsu based around this big secret plan.
Remember, earlier in the series, someone said that nothing can stand in the way of Natsu, and it seems that the Dragon Slayers have some sort of hidden past which even they dont remember
(how else do you explain ...
When does the manga tell you that they are 80 years old? or when/where does it even hint at that?