A key question embedded in any asset management program is the how long will it last question. Being able to effectively address the remaining life question allows asset managers to preserve optionality - at those critical "fork-in-the-road" moments, you don't want to replace or renew assets that don't need to be, nor do you want to defer preventative action on assets needing action. Understanding the remaining life of an asset greatly enhances the notion of making the correct decision based on the right information, collected for the right reasons, and at the right time.
Check out PVC Longevity Report: Affordability & the 100+ Year Benchmark Standard by Dr. Steven Folkman, Ph.D., P.E. (link).