[gambiting]

CDs and DVDs have horrible shelf life because they all use organic dyes. Some Blu-Rays do too, but you can still buy Blu-Rays with metallic dyes which should work for decades(panasonic BD-Rs are guaranteed for 50 years).

In fact, do you remember the very first, early writable CDs? They all were blue on the bottom - that's because they used a metallic dye as well, I imagine 99% of those discs will be perfectly readable today.