How long do shower tubs last?

On average, bathtubs last 10-30 years, depending on the bathtub material. Modern, inexpensive tubs made from acrylic and fiberglass will last 10-15 years. A porcelain-enameled cast-iron tub can last much longer but you will need to refinish it every 5-15 years.

When should a bathtub be replaced?

You might consider replacing your bathtub if you can no longer tolerate its faded colors, or if it is completely worn out. However, the replacement process might be costly and messy, which should make you think twice about whether you really want to replace it.