Most guilds are made from younger people so those who are a little wiser around the edges might feel out of step. Still, you should be able to find what you want. My guild has a 55 year old whose son (at 31 year old) is also in the guild. Myself, I am 49 and can deal just fine with those junior whipper-snappers.
-- Rustyx --- 92R / 92S / 92M on Reni (Guild KnightShift). Yes, running the new FOTM R/M, cause I am not elf enough to be WD/S.
Oh, and people who have more than 3 classes are clinically insane.