My kids are 5 & 7 and they are nuts about mario & his pals.
We have a Wii right now but i'm considering a Wii-U for their birthday in august because it's backwards compatible to their wii games & those characters are what they are into.
Plus Wii-U has the games they want.
They even watch youtube videos just to see how to beat the mario games on the SNES & N64 (via emulator).
I'm 42 but I was commodore 64/Amiga kid.
My little brother is 36 and was the NES & Genesis person of the family.
I did have a dreamcast for a while and a storage tote of game discs.
It still runs.
I've had it apart a few times to tweak the laser though because it stopped reading discs.
I never got into consoles though.
I was the guy plugging his win 98 tower into the TV so we could play madden.