A few variables to consider as to processing, storage, etc. I recently looked at my E4 slides I processed in college 1975. I don't see any fading in them...look as good as ever. And they were my first attempt with E4. Wished I would have shot more. I'm trying to shoot more these days 135 as well as 120. I use a Kodak pocket viewer for the 135 at first and then maybe once a year set up the projector ...might be awhile until I can project the 120...if ever. I have scanned and printed very few.