Other than my hands, this is my oldest tool, a cheap screwdriver that is about 3 inches long that my dad bought for me from a car parts shop when I was 10. Now, more than 40 years later, it is still with me after being used to lever the lids off Airfix and Humbrol paint tins, then some years being used to repair electronic stuff when I was an apprentice, and nowadays as my tool of choice to tighten the frames of my spectacles. It has been hammered, bent, burnt with a soldering iron and chemically damaged by a range of adhesives, cleaners and whatever else has found its way into my toolbox over the years.
Down in my basement I also have a wooden toolbox that was made for my grandfather by one of his brothers in 1915, which is something else I treasure. However, if the Russians ever come (I live in Poland near the border with Ukraine), it will be my screwdriver that I will be taking with me. It is a lot lighter to carry :-)
trevor