As far as "old" goes the term is not definitive. How old is old? If you were given an active bee hive you might want to use it long enough to change out the equipment. To me there is a difference between used equipment and old equipment. Anything that looked like it was less than 5 years old I would take a chance on, but I don't have a business at risk.
I have said this before, what is not clear to me is the asset value for bee equipment. When people such as yourself make a comment that you wouldn't use old equipment it leads me to believe it depreciates rapidly.