Hmm my introduction to gaming was via a broken arm when I was 7, there were 4-5 that I played at the same time.
Fifa '98 (PC)
Dr Mario (aka tetris :S GB)
Legend of Zelda: Link's Awakening DX (GB)
Wave Race (GB)
Super Metroid (GB)
However, as I sit and think about it, it was more likely to have been when I was 4. There was a Space Invaders arcade machine in the corner of my dad's local pub. Never forget the day I watched them dump the thing after some idiot broke it by punching it in a drunken rage...