Toilets are designed to be tough, durable, and long-lasting. This means the average toilet can survive up to 50 years. However, normal wear and tear relegate lifespan to a realistic number somewhere around 25 years. After a decade or two, you will experience a decrease in water efficiency, slow flushes, and more problems that may require the use of a plumber to troubleshoot. The primary reason for replacing a toilet is when the porcelain becomes cracked. Unfortunately, when a toilet becomes cracked, there isn’t much you can do. Other common reasons include a desire for a more efficient toilet, a need for a disability-friendly toilet, and if you are remodeling your bathroom.