Oh, I love these threads.
I got an NES when I was 4, but it eventually died and I got rid of it when I was nine. I bought a new one about three years ago at a garage sale and fixed it up.
I got a Game Boy when I was 7. It's still kickin' around because it is FUCKING AWESOME.
I got an SNES when I was 8. My nephew currently has it, while I bought a 2nd gen SNES at a garage sale and currently have.
I got a 1st gen Genesis and a Sega CD when I was 11, but stupidly let my parents sell it at a garage sale. I got a 3rd gen Genesis from my then-girlfriend for Valentine's Day a few years ago, still missing a Sega CD.
I got a Game Boy Color (Uh...Pikachu edition) when I was 13. It's still around here somewhere.
I got my Master System, Game Gear, 3DO, and TurboDuo from various garage sales over the last few years.
I got my Nomad from my friends for housesitting a couple of years ago.
Which basically covers "classic" consoles. My more modern stuffs (N64, PSX, Dreamcast, GCN, PS2, XBox, 360, Wii, GBA, GBA SP, GBA Micro, DS, DS Lite, PSP) I've just gotten when they came out or a couple years later and still have.