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.
In 1990 I was running a very tiny Unix clone at home (Coherent on a 286 PC w/ 1 meg ram) and... I don't remember if I couldn't get a standard reader to compile on that or what the problem was, but anyways - I wrote an email/usenet reader for my own use.
33 years later, I'm still using it to read my email every day.
Also, I think I've had my pasta strainer since the 90s.