>>100723839F-15 eagle is being used "for the forseeable future" and will keep being produced until 2022, 50 years of service
and will keep being used for much longer
the B-52 will be used until 2050, 100 years after its first flight
the F-35 and F-22 is unlikely to completely replace them for a really long ass time
given that the T-70 X-wing and TIE/FO were upgrades designed to keep them useful
it is entirely believable that the same X/TIE designs would still be used 30 years later
