There's a difference between "it's an old design" and "they don't make them anymore."
Very true. And speaking of "they don't make them anymore," the Su-33 can be added to that list. The Russians ordered MiG-29Ks to replace their Su-33s because it's not economical to do a limited run of Su-33s and the MiG-29Ks are already in production for the Indian Fleet Air Arm. So, unless the Chinese order a whole bunch of Su-33s in the near future, which isn't likely since it looks like they're planning to make their own carrier aircraft, I imagine they'll be scrapping the tooling for the Su-33 in the near future.