WHAT IS THE AVERAGE LIFESPAN OF A PET FERRET?
The answer is 6 to 10 years, although they have been known to live up to 12+ years.
HOW OFTEN SHOULD YOU COMPLETELY CLEAN A GERBILS CAGE/TANK?
This is sort of a trick question. I would recommend washing any plastic or ceramic objects in their cage such as their food an water bowls once a week. However most experienced gerbil caretakers only change the bedding every two weeks with some spot cleaning every week. The reason is that gerbils are desert animals so they do not eat and drink very much, which means that they do not produce much waste. They also get stressed if their bedding is changed too often. If it is dirty thought it can be changed once a week, but probably shouldn't be done any more often than that. For most gerbils though, every two weeks is fine.