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 have a Stanley Record no.5 plane given to me by my dad about thirty years ago. He inherited it from a relative when he was around the same age. It could be a hundred years old at this point. I've got a pre-war Wadkin bandsaw, must be close to a century.
I still have my first ever mountain bike from the early 90s, can't kill that thing either. It is a high quality machine but looks incredibly shabby now. Perfect for shopping, nobody wants to steal it.
I just changed my mountain bike because I was running out of easy trails around me and needed something a bit better. Funny thing is I still use the shoes I bought with the old bike. They are about to fall apart but for now they outlived my bike.
A well maintained bike has incredible durability. I don't use this one off road any more because I bought a suspended machine fifteen years ago but I can't bear to part with my old friend. With a little imagination they can be modified for a new purpose. It's a fun way for kids to learn basic skills.