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Scott Forrestmost 120 yr-old photos we find on ebay took 120 years to get as faded as they are now, and that still isn't too bad or we wouldn't be bidding on them. I figure mine can hang on the wall for another 20 years, and if they fade into oblivion (which they won't), I can live with that. Another way to think of it - 200 years ago there were NO photographs on the entire planet, so it's not really that big of a deal.
If you have a photo and you like it, hang the damned thing on your wall and don't worry about it - I doubt you'll notice any changes in your lifetime.