I'm really impartial to any of the choices because I don't own any of them, but isn't Wii free online too?
Why does age matter? My step-father owned one, and we still have it. It takes quarters, so I sit at it all day just playing. It's great fun.
Super Nintendo was the Boss. N64 is pretty amazing to with some of the games it had. But... considering PC has all those games on emulators... I guess it kinda wins.