Well, how about this? My character limits don't seem to match up with what I've seen in this thread.
Joined: 2007-05-07 14:51:26
Family Fame: 20
Medals: None
Donate: No
Character limits: 10 total, 4 active, 4 nobles
Length of playing also contributes. I remember hearing it was around 3 years, but definitely not more than 4.