This question tests restraint. Eighteen-year-old vinyl windows that operate, lock and show no seal failure are performing every function a window has, and there is no observation to report. Raising an age-based concern anyway would be inventing a finding: it would suggest to the client that replacement is imminent when the evidence says the units are working, and it would dilute the genuine findings elsewhere in the report. Service-life framing has a place — it belongs where a component's condition or age genuinely warrants planning, such as a water heater well into its range or a roof covering near the end of its life. Here the components are mid-life and sound. The correct report entry is that they were examined and function normally, which documents coverage without manufacturing a concern.