how old was your chinnie when they passed?

For those of us who have had chinnies who have passed away, I'm curious how long the average lifespan experienced by us is. I hear that they can live up to 20 years old, but how common is that? Please answer with the age your chinnie was when they passed away naturally. (I mean no disrespect to those who passed away from illnesses or injuries, but I'm curious of the "natural" lifespan, if that makes sense).