Back in the PS2/Xbox/Gamecube era the SNES and Megadrive seemed to be retro while the PS1 and N64 were just “old”. So maybe 2 generations ago is the start of retro.

I think it’s definitely a lot blurrier now though. The differences between consoles and the leaps between generations are less pronounced, and there are so many y rereleases and remasters now keeping older games fresh.

They were still making MiniDiscs and MiniDV tapes? That seems more of a surprise than the Blu-ray discontinuation.