I found an old roll of Kodachrome 25 in a camera that quit working on a trip to Yosemite in 1980. The camera was in a box in a hot garage for 20+ years before I had it processed. To my surprise the slides came out great. Granted, it is not typical that film that old would be so good with vibrant colors and no side effects. Now if I could only find those slides after 5 moves...