Some estimates put conventional CD and DVD lifespans at 25 years, however they can last decades longer than that if they are stored away from UV light, and stored in a moderate temp and humidity controlled location. Their lifespan also largely depends on the quality of the manufacturing process from the factory.
Under similar conditions, blu-rays are estimated to last around 100 years, and blu-rays that use non-organic dye layers (such as M-disc) can reportedly last 1000 years or more.
As moisture finds a way between the layers, the disc will degrade. Too much bending or flexing of a disc will encourage separation of the layers.
Some estimates put conventional CD and DVD lifespans at 25 years, however they can last decades longer than that if they are stored away from UV light, and stored in a moderate temp and humidity controlled location. Their lifespan also largely depends on the quality of the manufacturing process from the factory.
Under similar conditions, blu-rays are estimated to last around 100 years, and blu-rays that use non-organic dye layers (such as M-disc) can reportedly last 1000 years or more.
As moisture finds a way between the layers, the disc will degrade. Too much bending or flexing of a disc will encourage separation of the layers.
Source: am a big optical media nerd