The answer to 'lifespan of bathtub' is that a well-maintained bathtub can last 10-20 years on average. The lifespan of a bathtub depends on the material it's made of, how often it's used, and the quality of installation and maintenance. Acrylic and fiberglass bathtubs tend to last 10-15 years, while cast iron and porcelain-enameled steel bathtubs can last 15-20 years with proper care.
To maximize the lifespan of your bathtub, it's important to clean it regularly, avoid harsh abrasives, and address any cracks or chips promptly. Over time, the sealant around the tub can deteriorate, allowing water damage, so re-caulking every 5-7 years is recommended. If you notice significant wear or damage, it may be time to consider replacing the bathtub altogether.