I always figured Admiral Morrow was talking about the time elapsed between the Enterprise's refit and the period of Star Trek III - from 2271 to 2285. If she was commissioned in 2245, and likely built a few years earlier, then that would indeed make her spaceframe at least 40 years old.
I think the most realistic interpretation is that the Enterprise refit was a technology testbed for a wave of new build Constitution, and other associated classes of starships based on common components, and not intended to serve a particularly long active service career herself, hence her demotion to training duty by the time of Star Trek II.
Given that she was so badly damaged, and almost certainly undersized for the task of front line duty in the late 23rd century, I'm not surprised Starfleet thought it would be more economical to retire rather than repair her, and have her replaced with a new build vessel.
This situation has a vague real world parallel in the Royal Navy's decision to replace the 20,000 tonne Invincible class aircraft carriers with the 65,000 tonne Queen Elizabeth/CVF class. The Invincibles aren't especially elderly (Illustrious was was commissioned in 1982, and Ark Royal in 1985, making them around half the age of the USS Enterprise CVN-65) or in poor repair, but they are undersized for Britain's stated foreign policy goals of being able to project effective air power anywhere around the world.
Consider the Enterprise as the Invincible class, and the Excelsior as the CVF.
I think the most realistic interpretation is that the Enterprise refit was a technology testbed for a wave of new build Constitution, and other associated classes of starships based on common components, and not intended to serve a particularly long active service career herself, hence her demotion to training duty by the time of Star Trek II.
Given that she was so badly damaged, and almost certainly undersized for the task of front line duty in the late 23rd century, I'm not surprised Starfleet thought it would be more economical to retire rather than repair her, and have her replaced with a new build vessel.
This situation has a vague real world parallel in the Royal Navy's decision to replace the 20,000 tonne Invincible class aircraft carriers with the 65,000 tonne Queen Elizabeth/CVF class. The Invincibles aren't especially elderly (Illustrious was was commissioned in 1982, and Ark Royal in 1985, making them around half the age of the USS Enterprise CVN-65) or in poor repair, but they are undersized for Britain's stated foreign policy goals of being able to project effective air power anywhere around the world.
Consider the Enterprise as the Invincible class, and the Excelsior as the CVF.
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