Given the ever-improving quality of taps, modern tap designs can be expected to last between 15 and 20 years typically.
However, there are a number of factors that could impact on the lifespan of a tap one way or another. These include the make and model of the tap, the regularity with which it is used, and the hardness or quality of the water that flows through it.
There’s lots more information in our blogs, A Complete Guide To The Different Types Of Bathroom Taps, and The Bathroom Taps Buyer’s Guide.