We are approaching the time where the lifespan of CDs (DVDs, BlueRay etc.) from the late 90s and early 2000s reach their limit.
In general, factory-pressed CDs and DVDs are expected to last many years if you store them under ideal conditions, but the exact lifespan can vary. Some studies have suggested that factory-pressed CDs and DVDs may last for up to 20 years or more under ideal conditions, while others have found that they may begin to degrade after just a few years.
I once had a brand new disc (from a multi disk movie box) which has never been played. When I inserted the disc into a laptop disk drive (those where you have to press the disk onto the holder in the center) the disk completely shattered. It turned out that the material of the disk has aged to a point where it became brittle, despite of never been exposed to UV light or anything else. It probably could have been stored at wrong ambient temperatures in the warehouse. The said disc and the movie box was made in 2004.