Member vs. Senior Member

[MajorCord]

Hi! I'm fairly new to the website and I have enjoyed reading many of the posts. I have a non-basketball question regarding the site. I have noticed that some users are listed as "Member" and some as "Senior Member". What determines this status. At first I thought maybe those that had been registered for a certain amount of time were "Senior Members", but then I came across one person who registered in 2006 but was listed as a "Senior Member". It is not really that important, I was just curious more than anything else.