Music CDs or data? Music CDs have built-in error correction, data CDs don’t. You can certainly extend the lifetime if they’re stored in the dark in a cool, dry place (UV light, heat, and humidity all damage the dye that gets burned to encode them) but they’re not reliable archival storage without error correction.

They don’t last very long. About 5-10 years at most, and that’s if you bought special archival burnable DVDs. If you depend on them for backups, you should check the integrity annually (always include a checksum like SHA256 with any backup archive).