17 years expired film from my photo teacher's cupboard! I quite like the over all color shift, but I've discovered that expired color negative film doesn't work very well indoors.
mariskaviska, grazie, reneefee, barakalofi, anomalocaris, dasjuerg, herbert-4, pawathj, mylatehope & realrampage.
The older the film is, the slower it is, after expiration... better stored cold, worse stored warm. After ~15 years ISO 200 becomes ISO ~50. Some very slow B&W films have VERY long shelf lives... check out Adox CMS 20 ISO 20. It has no expiration date. You could put that in your Pyramid for the afterlife.