This is really very interesting. At our local EAA chapter meeting we are
always looking to get younger folks to join and learn about aviation. As
I look around (and I am 61) pilots now tend to be gray haired folks.
Those that still have hair. Your #3 question shows that we are an aging
population. I know that this is not a scientific study, but I think it
does reflect what is going on. I have not read any other comments yet,
I'll scroll down and see.

What I find especially interesting is that that 90% of the responses to a
pilot's forum on an internet site were in the 40-70 range.

I would think that the a usenet newsgroup based survey would skew the results
to a lower age group - as a percentage of the general population, how many 70
year olds spend a whole lot of time in Usenet?