I haven't asked this yet, but this is actually a important question to me.
How wide of a range can you have of levels in a party?
Can it be 1/3 your level like in EverQuest? (Lv 40 and 60 can party)
Or God-Forbid if it is like Final Fantasy XI, basically within 2 levels (Lv 40 - Lv 42)