Does anyone have longevity information on commercially-pressed CDs and DVDs? I know that from my own experience they last longer, but not forever. When they wer

Does anyone have longevity information on commercially-pressed CDs and DVDs? I know that from my own experience they last longer, but not forever. When they were new, one of CD's major selling points was their longevity. This seems have been wildly over-estimated, however.