1. 39
2. Male
3. Actually seeing something (most likely airplanes or satellites imo)
4. Yes
5. Yes
6. Most are of terrestrial origin. It is my personal belief that some of the unexplained cases may be extraterrestrial, but my belief and a buck will get me a cup of coffee at 7-11. I fully accept that a high standard of proof is needed for such an assertion.
7. Probably not.
8. Yes. An advanced alien race would likely have at least a million year head start on us technologically. But if they exist, they (probably) haven't found us yet and may never find us; it's a big galaxy, and may be even bigger than we first thought.
9. Yes, via SETI.