Another good source is the Roxio newsletter:
https://www.roxio.com/en/jhtml/subscription/cdrnewsletter.jhtml

On degradation of CD's:
https://www.roxio.com/en/support/discs/dodiscsdegrade.html

TDk specs a  minimum70-year life, Kodak claims 217 average. But their
testing on older CD's showed you should re-copy within 10 years of original
creation, to be "safe", depending on your record/player combination and
medium choice.

Not only are you concerned with overall life of the CD, but also error rate
in the recording and the speed at which burned.
https://www.roxio.com/en/support/discs/discspeed.html is rather interesting
in that regard. Music errors are any times undetectable. One bad bit or two
in a picture also not (usually) a big deal. A single error in a program
could result in it not functioning, or an archive file not being
extractable, while an error in the directory for the disk renders the entire
thing unreadable.