This makes me feel really old. I remember getting my first Game Boy for my 10th Birthday in 1989 along with Mario Land. And yes, that does mean I'm 30 this year. Bugger.
Got my Gameboy in 1991 when I was 6. Came with The Terminator (the hardest GB game ever) and Tetris. Upgraded to the Pocket Gameboy in '96 and then to the Color in '99 The Advance in it's launch week (as a gift for passing my GCSE's) and then the SP sometime after. Traded my entire Dreamcast collection for a Jap DS launch model (stupid idea) and then that went into trade for a PSP. After my whole history with the Gameboy I am now back to the original and I love it better than all of the iterations that came after it.