Useful life depends on service expectations
An asset can remain physically present but no longer meet required capacity, reliability or accessibility.
Condition can revise age-based assumptions
Inspection evidence may support extending or shortening a planning horizon.
Uncertainty should be visible
Ranges and confidence levels can be more honest than a single exact year.
Use it for portfolio planning
Remaining-life estimates help forecast waves of renewal demand across many assets.
Scope. This page explains asset-management concepts, not operating procedures for critical infrastructure. Inspection methods, intervention thresholds and safety decisions must follow the asset owner’s standards, local rules and qualified professional judgement.