For example, if a urea fertilizer factory has a lifetime of 25 years, what to do with the plant after 25 years? Even if the life cycle assessment is done, making necessary processes development for the continuation of the plant for several more years, what would be the ultimate fate of the plant? Should we build a new plant, or keep continuing making necessary upgradation? There are several other considerations or assessment to make such a big decision, but I am curious about the usual or standard practices. In some cases, I have observed that if a plant was designed for 20 years, after 60 years the authority is still running the plant.