A lot of medical labs still use analyzers and stuff from the '80s and only replace them when they die, so a lot of people getting healthcare might be using older tech than they think :)
Whilst I'm being cheeky, spoon and probably bowl technology remains relatively unchanged for a huge amount of time.
I guess the oldest thing I regularly use is my tractor from the '90s. I do often wish I hadn't accidentally killed my Amiga 500 as I'd likely still be gaming on that occasionally.
It's not the most popular but it is eaten. My local supermarket sells it.