It all depends on how you take care of your truck. Some people never have any problems with their trucks and can drive them for 200,000 miles or more without issue. Others might start having problems at around 100,000 miles. It really varies from vehicle to vehicle and driver to driver.
If you're thinking about buying a Chevy Silverado that has already hit the 200,000 mile mark, just be sure to do your research first. Make sure to get a complete history of the truck including maintenance records and any previous accidents or damage. This will give you a good idea of what kind of condition the truck is actually in.
Once you have all the information, decide if the truck is worth its asking price and go from there. With a little bit of care and attention, a Chevy Silverado can easily last you for many years and miles to come.