Is there an easy way to delete old Forum members? I looked in the Members table but wasn't sure it is safe to delete members from there? I believe there is a "last visited" date in which I could sort the table. Also, this would not delete their posts, correct?
Deleting them directly out of the members table, without taking care of the associated records will cause problems. Deleting them using the forum interface will replace the member's name with N/A - and how is that really different other than making a thread even harder to follow if more than one participant gets deleted.
Partly out of curiosity, why do you want to delete the old members? There's no harm in leaving them there.<