What item have you been using on a daily basis for the longest amount of time?
Sometimes I will use something and realize I've owned it forever. It's a nice change in our throwaway reality. I think my personal record is a bicycle multi-tool I got for one of my first bikes, ~25 years ago. Still have it, still use it. When it comes to electronic devices I have a Panasonic mini Hi-Fi from ~2005. Never felt like changing it.
I bought my mechanical keyboard in 1997. It has the original large round plug on it and through the years I've had to buy adapters to go to a ps/2 port and now to usb, but the keyboard itself still works pretty well. Definitely time for a good cleaning though, I've been having a lot of stuck or missed keys lately. Since I write code this keyboard has seen a LOT of daily use over the years.
An Enermax keyboard has been my daily driver as a programmer for my career that started in 2007. It still works just fine and I still have no reason to change to something else. Lots of reasons not to, since I like the classic keyboard layout and the flat laptop keys.
Trying to type anything on the chiclet style keyboards reminds me of the days of learning to code on a ZX81. You just can't type quickly on those without the proper feedback. If my current keyboard ever dies, I don't know what I'll do.
Honestly I can't believe how lucky I've been. I have been writing code for over 40 years now and the only time I had trouble with carpal tunnel was at my first job stuffing circuit boards. If that ever changed I'd be in real trouble because there's not much else I can do which doesn't involve working at the computer.
The switch to something like a Microsoft natural fixed me very quickly! That's all I use to this day but a day doesn't go by without me thinking fondly of my heavy, noisy, IBM PS/2 keyboards. :)