Hi Jon Regan,
There are a couple of apps that, although do not do exactly what you are looking for, I think they might help. Otherwise it would be possible to create such a custom application using our AppSDK and LBAPI. This would require either internal development resources, or we offer a technical services team that can build custom applications of this type at a cost.
1. The Open Defect Age will show you your oldest open defects and provides chart that displays mean age of open defects.
2. The Defect Summary Matrix application provides a count for each state by priority.
If you would like to pursue a custom application, please log a with support and we can put you in touch with your account representative.
-Sean Davis