I have some 1999 era DVD-ROM still working perfectly last time I checked. And I didn't put any care in storing it "properly", normal drawer. I still have musical CDs from the 90s that have been remastered 3 times by now and I prefer the original version I hold. Yes I can download some pirate mp3 version of it, but still, no Spotify or music label can remove it from my hands now.

The oldest game CD-ROM discs I have are for the Amiga CD32 and were made in 1993; they still work. My PSX and Saturn games from the mid-nineties work. To say nothing of cartridges (my NES games from the 80s work), where the only issues I've faced there are that the batteries for save files that eventually die (but can be replaced).

That would have been prior to DRM that can basically brick the data