There’s no hard and fast rule that says how old a console needs to be for it and it’s games to be considered retro.
There are a lot of people that say that anything from two generations ago is retro. That would put the PlayStation 3, Xbox 360 and the Wii in the retro camp.
Do you think the PS3 generation is retro or if not what consoles do you consider to be retro systems?
I’ll probably consider them retro when all of the consoles from that generation (PS3/360/Wii) are no longer supported. The Wii shop has been closed and the 360 store closes next year. When the PS3/Vita store closes then I’ll consider them retro consoles.