I came across this article about the oldest device or gadget people have and still use. It got me thinking and for now I think my oldest working device that I
still use is a GE AM/FM kitchen radio. It has an attached electric outlet that can be turned on manually, or set set to turn on at a certain time. It's the kind mounted under the cabinets so does not take up counter space. It also has a light to illuminate the counter with Hi and Lo settings for the light level. The tuner is a dial that moves a red bar through the frequency scale. How quaint. Oh, reception is pretty good.
I estimate it's age at 30+ years.
https://www.bbc.com/news/technology-52965974