My oldest would be the Atari 2600. It still works great!
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Favorite Pokémon: Buizel, Turtwig, Typhlosion, Lugia, Mudkip, Charizard, Zigzagoon, Floatzel, Torterra, Groudon, Linoone, and Meowth.
~ Owner of Pokémon Platinum ~

I'm not removing this from my sig until another Pokémon movie is in theaters stateside.

For the time being, the NES is the oldest system I have. I do have Atari 2600 cartridges though.

My oldest is the NES but it doesn't work that well.
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FAVORITE POKEMON: BUIZEL , GARDEVOIR , LUCARIO, DIALGA, LATIAS, PIPLUP, ARCEUS and LOPUNNY

i don't know like a month ago it worked fine but then it just stopped working but it doesn't matter, it's in the garage somewhere and i could just buy games from the Wii shop channel. It's ok.
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FAVORITE POKEMON: BUIZEL , GARDEVOIR , LUCARIO, DIALGA, LATIAS, PIPLUP, ARCEUS and LOPUNNY

Before I was born my older brother bought an Atari 2600 I still have it and it still works
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Dr. Munch is hungry! oh no! protect your children!

Megadrive

I own Nintendo 64 and Game boy Color.
*gets booted out of forum*
lol

I do remember playing SNES at a friends house though.

*Wikis to compare dates*
That would have to be my Sega Genesis, which is still working fine.

My Nintendo DS lite

My parents had always been incredibly when I was little

My oldest is a gamecube. I got it the Christmas after the gamecube first came out. It has pokemon XD skin on it and still works amazing.

My NES my oldest system. It works amazingly though; I replaced the old connector with a new one that doesn't require one to push down the tray thingamajig, meaning the pins won't bend out of place like they do with the normal one (which is why it doesn't recognize games after a while). NES connectors aren't hard to fix, but doing so is annoying enough to make my extravagant 15-dollar purchase worthwhile.
Oh, and did I mention it was 11 dollars at an auction, along with a model two Sega Genesis?

I have an original N64 (So if Banjo Kazooie had Stop 'n' Swop I'd be able to do it). Not a whole lot of games for it though.

Mine is a PS1. I broke down 2003.

I used to have an Apple II. Good times...

Mine would be the PS1. It is still working fine.

I have an old NES that doesn't work. It's quite a nice decoration, sitting in my room with a Mario mushroom figure on top of it, though!

I intend to custom paint it for fun, as it is rather dis-coloured..

Whuzzat, old computers count, too? In that case, my oldest system is my TI-99/4A, but it doesn't read cartridges correctly. Maybe it just needs a good cleaning.

I also have a PS1 and a gameboy lying around...

The oldest system I have is a GC. I don't play it anymore since I have a Wii.

My oldest console would be one of the two Nintendo 64's I have. I have one at both of my parent's houses. The one at my dad's house is still intact to my knowledge, and the one here is still working fine and sitting in front of the TV. I haven't played much recently though.

game boy was my first

Playstation 2

I think I got it around 2003

Since I don't really know whats the oldest I'll name a few, NES works fine, game boy and game boy colour both work fine, PS1 never played.

NES is the current one.

Atari 2600

I wish I had an Atari 2600.
Actually, my mother had one but I don't know what happened to it.