It is joked that PLAAF keep some J-7 around so they can show them off on the Chinese New Years Eve celebration show to subconsciously say "oh we're so poor, please send money so we can afford better planes".
Of course it's not true, given enough time they will all be replaced, but these things take time when we're talking a force the size of PLAAF, it wasn't that long ago that people were seriously discussing that tactical J-8 should use when taking on F-22. At least those days are behind us.
That said, maybe keep a few J-7 around and send them up next time USAF sends in U2 so we can relive the glory days of the cold war 1.0.
Of course it's not true, given enough time they will all be replaced, but these things take time when we're talking a force the size of PLAAF, it wasn't that long ago that people were seriously discussing that tactical J-8 should use when taking on F-22. At least those days are behind us.
That said, maybe keep a few J-7 around and send them up next time USAF sends in U2 so we can relive the glory days of the cold war 1.0.