I just processed several rolls of 120 Pan F film that I had shot but did not process for about 5 years. They were kept in their boxes in my basement office, but not refrigerated.
The image quality was severely degraded and covered with black spots. I then tried processing rolls of Tri-X that were shot at the same time and kept under the same conditions.
The Tri-X didn't show any degradation of the image or have any black spots. Both processed in DD-X. Apparently Pan F does not hold up under long term storage.