Mark,
I’m not sure what kind of database you are using but you could write a sql script ( which works with just about every type of DB ) to run automatically every day at prescheduled time. Script will look at the date the thread was started which I noticed is on the left hand corner and subtract that from a target date you set in the script. Equal to or larger than sort of script that moves the content to a pre-defined folder.
Just my 1/2 cent.
