DVD shelf life

I recently took a look at a bunch of my backed up DVDs of event videos (I back everything up onto dv tapes as well but the dvds have menus) and had a lot of trouble getting them to play in stand alone players and dvd-roms. Have they started to go bad over time? The temperature they were sotred in wasn't overly hot. I hope this isn't happening to my clients. What media is everyone buying. I need something with a silver matte finish so I can print onto it using my thermal printer.
 
I'm sure it's just personal experience, but I've had the worst luck with Riteks and the best results from Taiyo Yuden.
 
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