Gmail has a nice feature that permanently deletes e-mails after they've been in the Trash folder for 30 days. This is pretty clever, because if I don't need a trashed message back after 30 days it's very likely that I won't ever need it again.
I want to do the same for my Trash folder in OS X to make the best use of my disk space. Is there an easy way to automatically delete trashed files after 30 days?
Meta note: I don't think this is a duplicate of another thread because there the trigger is "disk space drops below X GB" and the effect is "the entire Trash folder is emptied". I only want to autodelete files older than 30 days.