The TV in my bedroom dates from the early 80s. It’s a Curtis Mathes. It has 13 channels.
I have my mother’s Osterizer, which was a wedding present: circa 1953. 
Still works just fine and with all orginal parts. Many a margarita - milkshake - Carnation Instant drink - etc. has been mixed in it over the years.
My primary bench power supply is a Sorensen Q-Nobatron QR40-2A. I bought it used when I was in high school, in 1976 or so. It was probably a decade old at that time, so it’s likely to be over 40 years old. I use it every day, and it works perfectly.
Care to enlighten me- what is an Osterizer? 
that is a model of electric food blender made by the Oster company in the USA. they made it popular.
Somewhere around 1977 or so, I got a clock radio that had the buzzing alarm from hell on it, which was good because I am a very sound sleeper. This thing could wake the dead. It had this BWAAAAAAA alarm on it that makes the modern meep meep alarms look silly. The radio part of it died sometime in the 80’s, and the alarm on it finally died a couple of years ago. I can’t say I’m still using it because it did finally die, but it’s worth mentioning because I did get 30 years of use and abuse out of it.
I have a distortion circuit that I built into my electric guitar while I was in high school, around 1983 or 84. I had to repair it a couple of weeks ago, but it is still going strong. I also use a mixing board that I made around 1985 or so. It’s kinda funny because I threw it together just as a test kind of thing and never really expected to get much use out of it, but it has seen almost constant use for the last 25+ years since.
I also have some old oscilloscopes and other pieces of electronic test equipment which date to the late 1970s.
A smallish, mint-condition Sony boombox I bought around 1982. After a couple of years of use, it mostly sat in its original box in a trunk in my parents’ upstairs bedroom. I retrieved it a few years ago and it’s now in my home office.
I have a Magnavox record player and amplifier console set that are designed to look like pieces of furniture that date from the late 1950’s. The amp and speaker set need a little TLC, but the thing is 500 watts, when it was working it was louder than a jet taking off. The record player works like it’s brand new.
Atari 7600. How old??? I dunno–1980ish??? Works great, except the joystick tends to make everything go left if you aren’t touching it.
Also have a stereo system in my garage that Mrs. Hollister got when she was just getting out on her own around 1988. It had a CD player, so at the time it was pretty fancy.
The oldest electronic device in regular, daily use in my home is a Western Electric 302 telephone, from 1947.
Like Nava, our most complicated and old mechanical device is a 1917 Victrola. We do wind it up a couple times a year to assault ears with what passed as high fidelity 90 years ago.
My oldest electronic item is also an alarm clock. It’s got a tape deck, three levels of LED brightness, two programmable alarms each with a “beep” and a “music” time setting, and the radio has amazing reception.
I don’t quite know the age but I do remember rockin’ out to Wilson Phillips (mhmm) playing on said radio, so let’s say I’ve had it at least since 1990. Not bad, considering I was only 11 in 1990. So it’s been with me more than half my life.
I’m really afraid to replace the alarm clock. What if the display is too bright? What if it has terrible radio reception? I hope this thing lasts forever.
The tube amp in our rec room has tubes from the 1930s in it. If components count.
The oldest whole electronic device would be the 1957 tube radio, which we only use when we listen to live radio broadcasts… which just isn’t very often at all.
I recently got rid of my portable TV, ca. 1975, so I think it would be my Panasonic boom box, ca. 1989.
Question for those of you with tube-based electronics - how do you keep them in working order? Don’t tubes burn out and need to be replaced eventually?
Vacuum tubes are still for sale.
The oldest electric thing we still use is the 1979-ish crockpot–except that it just finally went out. To be precise, the cord is messed up, so we might be able to fix it.
Next up would be one of our mixers, which were purchased sometime in the 80s. We have a total of three electric hand mixers. One is used, so it might be even older.
If we stick with electronic, I guess it’s the computer hooked up to my TV, which was purchased around 1999. I don’t think any of our TVs are older than that, and we don’t use that many electronics.
1978 Setton receiver & Acoustiphase speakers. Oldies but goodies.
High five. I also have an original NES, but I don’t use it too often. Damn things get one speck of dust in them and cease working. I get tired of blowing into the cartridge every time I want to play. Does that even work? Why does everyone do it?
I have a Kenwood Basic M2a amp and C1 preamp. I guess they’re '80s vintage.
I still use the hot air corn popper my brother and his wife gave me in August '84.
My toaster is a Sunbeam model T-20B self-lowering unit. I know it started production in the '50s, but I don’t know how old it is. I bought it and the stereo equipment at yard sales. I guess I’ve had them about 7 years.
A middle/late '60s Philicorda, I guess. I also have a late '70s Kenwood Chef a901, a late '80s Amiga 500.
