Perhaps you could exchange the; PC, Wii, 360, and PS3 Sub-Forums for a Generation forum? I dont know what each generation is lets say NES is G1, SNES G2, N64 and PS is G3

You would apply it like this

Forum: Video games

Sub-Forum: Generation 1 (description: NES)
Sub-Forum: Generation 2 (description: SNES)
Sub-Forum: Generation 3 (description: N64 and PS)

You might even be able to split it up by the year people were born? I was born in 89' and the first thing i remember playing was the NES, i suppose kids from late 90' are probably more inclined to have played a playstation 2? Althought i dont think that would allow for very intellectual people seeing as for the Y2K bunch you would be discussing xbox 360 with 8 year olds. I think the Generations might work out well though.