LOL! I was 10 when D&D first hit the shelves, and I was hooked at that age... 1974... by the time I was in Jr High, we actually had a "D&D Club" officially sponsored by the school and likewise when I hit high school in 1978.
We played the gamut back then (in no particular order, since it's all a blur now lol):
Chainmail
D&D
AD&D (yes, these were a good 90% different animals)
Azanti: High Lightning
Traveller
Gamma World
RuneQuest
Ogre
Car Wars (okay...so we didn't exactly rp in this one, but it was still an rpg!)
Call of Cthulu
Ravenloft
This branched out into many other games and sub-genuses of the ones listed above (such as Menzoberanzan (sp?), Dark Sun, and Forgotten Realms) and eventually, here and there, we took it to the early home PC's such as the Apple ][e and the C= as well as the TRS-80. Pools of Radiance will probably stand out as the first of the great D&D-brought-to-computer games of its age...
Oh! I forgot Thieve's World and Ringworld! Okay, so those were much later, like Vampyre: The Masquerade (NOT the card or computer game...the rpg).
Okay...my rpg game geek mind is about to explode...I need to stop.