This is a tough question because the lifespan of your shock absorbers (also known as damper) really does depend on several factors, including how you drive your car, where you driver or what kind of roads you drive on, how old your vehicle is and more.    Pot holes, for example, can cause your vehicle to bounce which will cause your shocks to wear out faster.
You may want to consider having your shocks inspected on a regular basis by one of our mechanics to ensure they are replaced before they become a problem.