Just a few years ago, CDs were still ubiquitous and one of the things the Geekier elements worried about was that they would become unreadable over time. That was probably a reasonable concern, especially for CDs that the user burned himself on his computer.
As for professionally manufactured CDs, we still don’t know and as Kontra points out we’re not apt to find out.
People used to worry Compact Disks would lose all their data due to delamination and oxidation within a coupe of decades. The format didn’t last long enough for us to test. Sad!
— Kontra (@counternotions) December 27, 2017
Yes, yes, we all still have CDs but when was the last time you used one? My laptop doesn’t even have a built in player, something that was unthinkable just a couple of generations ago. Even for music, I don’t bother anymore. I ripped the CDs at a high bit rate and listen to the result. Some people will tell you that they can hear the difference and I have no reason to doubt them but I’m not one of those people.