Tree stand harnesses are not made to last a lifetime, no matter how sturdy they are. They are systems designed to keep you safe while you're using a tree stand, but maybe you didn't know that most accidents occur when climbing or descending.
Some accidents are caused by faulty harnesses, which is why it's a great idea to inspect them regularly for signs of wear and tear. First of all, as soon as you get your harness, you should check the stitching as well as the general construction for damage.
After each use, it would be a good idea to take a close look at the harness. Also, at the end of each hunting season, you shouldn't overlook this step. Weather elements may take their toll on the integrity of the harness, which is why you must run this visual inspection when you get back from your hunting trips.