Milairjunkie, you got it. The Hawker Hunter has been brought back to active duty by the Lebanon.
I should have added that a few models after been aquired 50 years earlier and being stored for 25 years were brought back to combat service, but I thought that was going to make it too easy.
And I thought the Mig-17 was retired... ooops.
It could be argued that the A-4 first flew in the mid 50's and the F-8 is supersonic.