We recommend not buying more wax than you can use within 6 months to a year. That being said, if stored properly it is quite possible that it can last much longer. For the best results, we recommend storing your wax in a cool, dry, dark place.
If wax does start to age, you may notice discoloration or yellowing of the wax itself, and/or a rancid smell due to the aging of the oil. If this occurs, we would recommend doing a test candle to check the performance and throw of your products before continuing to use the wax.