The average lifespan of a side by side refrigerator is about 13 years. However, this number can vary depending on the model and brand of refrigerator. Some models may last longer, while others may not last as long. Ultimately, it is important to consult with the manufacturer to find out how long your specific model is expected to last. Additionally, it is important to properly maintain your refrigerator in order to extend its lifespan. Regular cleaning and proper food storage can help to keep your refrigerator running efficiently for many years.