I'm 22, and...
If family consoles count, then the NES would be it. Otherwise, it would have to be a Gameboy Color.
I also got 1 continue on any game on it before bed when I was 5-ish. Needless to say, I used to be a beast at some really challenging games. (Contra, Life Force, Ghosts & Goblins) in around 2 lives per run through.