The WW2 era CV-6 was never included in those displays. And it was the one real Enterprise that should have been.
As for longevity of aircraft carriers. There's an aircraft carrier on display in Corpus Christie called the USS Lexington. It's one of the first WW2 era Essex class built and was launched in 1942. It was decommissioned in 1993. Making it also 51 years old at it's decommisioning. It's the sister of the Intrepid in New York City, the Hornet in Oakland, and the Yorktown in South Carolina.