A long-lived Shackleton airframe still needs modern mission systems

Would a Shackleton AEW introduced in 1952 be state-of-the-art in the 1950s and 1960s but outdated by the 1970s and 1980s?

Yes if left unmodified; the airframe could remain useful, but sensors and survivability would require continuing upgrades to stay credible against cutting-edge threats.

A 1952 Shackleton AEW could reasonably begin as a leading system and look dated twenty or thirty years later. The airframe itself descended through the Lincoln from the Lancaster, yet a proven airframe can retain useful life long after its original sensors and mission equipment age. Modernization therefore determines whether the aircraft remains merely flyable or operationally credible. Airborne-early-warning platforms face particular pressure because they must survive against the opponent's most advanced interceptors even when most aircraft in the battlespace are older. Airframe longevity and the faster technology cycle of sensors, communications, and survivability must be assessed separately.