The answer to 'bathtub replacement frequency' is that most bathtubs should be replaced every 10-15 years, depending on usage and maintenance. Bathtubs are designed to last for many years, but over time the materials can wear down, cracks may develop, and the finish can become discolored or stained. Regular cleaning and care can extend the life of a bathtub, but eventually it will need to be replaced for both functional and aesthetic reasons.
Factors that can affect bathtub lifespan include the quality of the original installation, the type of material (acrylic, porcelain, etc.), and how heavily the tub is used. Homes with multiple residents or frequent bathing will likely need to replace their tub more often than a home with light usage. Signs it's time to replace a bathtub include cracks, chips, discoloration, or a tub that is difficult to clean and maintain its appearance.