As a guild, our core will be turning 16 this coming spring, having formed long before World of Warcraft was even an idea. Our WoW presence has been on this server since its first few days. We are generally mature and friendly, but we also can get at each others' throats from time to time.
We generally run a very casual schedule with only one or two raid nights a week each lasting only two hours. Right now, these times are likely to be Wednesdays and Mondays from 8:30-10:30 server times. We use Mumble for voice communication and the in-game calendar system to generally handle the raid invites and basic attendance issues.
About our ideal raiders:
Someone who, regardless of the speed (or lack thereof) of progression, will log in for the posted raids as often as Real Life(tm) allows. You should be mature (and I don't mean this in the sense of the language that you use) and willing to listen and learn during raids. I prefer people who are fairly quiet on Mumble (although being willing to speak can be helpful); we have enough folks who enjoy distracting, I mean chatting, as is.
You do not need to be the most skilled of players, nor the best geared; these are all things that generally can improve with time, especially if you are willing to take advice. You also do not immediately need to leave your current guild to raid with us, although if you enjoy the raids and the people, we would encourage it in the future.
If you have any interest in joining us as a PUG, please send me a mail or tell in game. If you can't find me online, asking any member of the guild can often track me down if I am currently on an alt (or even when I'm not logged in sometimes).