oldest piece of software?
hard to say, but as soundhack is turning 22 this year, I think that's it.
oldest working computer/OS?
ibook from around 2001-02, OS 10.2
hardly use it, but there are a few things on there, that I for different reasons never upgraded on my main laptop.
oldest piece of (electronic) hardware?
first generation mbox also from 2001
oldest musical instrument?
my upright bass from Germany, ca 1880.