Perhaps as small gray text after the tags. I've been using the program for awhile so it would be helpful to see at a glance if I've got something hanging out there that I added years ago that got missed. I appreciate the ability to see it in to the task info popout but that requires me to know to look for it on a task and in a lengthy list it's easy to miss something.

For context, I use regular lists for individual projects or silos and a series of smart lists to pull from them so it's possible for a low-priority project to get shelved indefinitely and having a visible reminder "Hey stupid, this has been hanging out here for two years" would help keep things from being permanently shelved.