The life span of the climbing harness depends on how often/ rarely it is used. All harnesses should be checked before purchase and also there is a warranty of 10 years so it can be returned or repaired. If you use it more, it’ll decrease its life span. If it is frequently exposed to UV light or chemicals, nylon is degraded and the harness becomes weak. Many harness models have “wear indicators” which are the red materials or their stitching is exposed indicating that it is the time to replace it.