Cassette tapes have an expected lifespan of approximately 30 years under ideal storage conditions, though this can vary significantly depending on how they are preserved. The lifespan can reduce to as few as five years with improper storage, but conversely, with careful maintenance and appropriate environmental conditions, cassettes could theoretically last up to 100 years. This matters for those who have collections from the 1970s and 1980s and wish to preserve them for future enjoyment.

Storage conditions are the primary factor determining cassette longevity. Tapes should be kept in a cool, dry place with temperatures between 59 and 73°F and humidity levels of 25–55 per cent, away from sunlight, moisture, dust and magnetic fields. Additional maintenance includes storing them in protective cases, occasionally playing them to prevent the binder coating from becoming sticky, gently cleaning the exterior with a soft cloth, and rewinding tapes properly after use. Many experts recommend digitising cassettes using specialised services or computer recording software to preserve the audio before deterioration occurs.