Probably doesn't count since it's a computer system but I have an Atari 800XL with 1050 floppy drive. That would roughly be 1983.

Wiiu........it is the first console I bought with my money,  my family has gone through all the consoles the ps4-ps, xbox360-xbox, sega genesis, nes- gamecube, atari, etc but this is the first one that I bought for myself, by myself.

Sega master system 2 is still laying around in my parents attic somewhere. Its broken though

I still have both my SNES and N64, on display on a shelf.

Consoles I still have in my possession -

Atari 2600 (2nd gen) - shockingly it still works
ColecoVision (3rd gen) - My Dad used to sell TV's to electronic stores. One of his contacts basically gave him a Coleco and all of it's games for free because they sold so badly. As an 8 year old this was the best day of my life. This had the weirdest controller ever. Basically looked like a telephone pad. Loved playing "Rocky"

NES (3rd gen) - i'm pretty sure it doesn't work at all at this point.
Nintendo Gameboy (4th)
SNES (4th gen)- mine has taken on a nice piss yellow stain over time. Not sure how THAT happened.

Sega Game Gear (4th gen) - eats up like 8 batteries in 2 hrs

JVC X'Eye (4th Gen???) - played Genesis games and Sega CD games and one or two random JVC developed games. This thing died off quick, my father also worked for JVC... unsure if this even saw official US release.

Sega Dreamcast
N64
PS 1
GameCube

The fire retardent Nintendo used in the SNES was made different. Over the years it rise to the sruface. Turning the palstic yellow and making it brittle. This is what caused the werid color problem on certain parts. Some stayed the normal grey. Others, yellowed to high heaven. Here's a picture of my friends SNES I was cleanign and doing repairs on. The main body plastic was really bad.

TBH I'm more shocked to see a fat XBOX360 or PS3 still working than an Atari

I have an Atari Pong and Coleco Telstar. Both from 1976 if my memory serves me right.

Master system.

Atari 2600, NES, Super Nintendo, 360, Xbox One, Wii, Wii U, 3DS, 3DS XL. All operational.

Would you like pictures?