I was shocked to discover today that 3 audio CD-Rs bought in the late 1990's were unreadable by any of my devices.
They have been kept in ideal storage, with a constant cool temperature and darkness. What they all had in common was that they were all the "GQ" ("Great Quality") brand, purchased from Fry's around 1998. Two of them have a white painted finish, and the third has a matte-silver finish. The burned side is dark green in color and the burn area is quite obvious, but Windows reports that the disks are unreadable.
The good news is that I have many other disks that age or older that are holding up quite well. None of them are GQ.
Perhaps "GQ" really stands for "Gone Quickly."