[quote=@KazeXDZ]
Reserving a spot for myself and my friend, Rokku. Only because of the histories of our characters.  BTW, which of the available guilds has been around for at least 15 years?
[/quote]

Frenzy Plant has existed formally for 11, but before that it was a small gang of low-key magic users for an indeterminate amount of time.  I don't know whether or not that'd work for you.