If this poll represents a typical cross section of members then it's results are surprising to me. In every single age group film use is higher than digital use.
There are two rather simple explanations to this:
1) People discover this forum when they start shooting film. This has, indeed, been my case. I found out about RFF because I bought a Zorki to play with, and I wanted to see how I can shim the lens. Needless to say, I found Brian's posts, etc... Now I have a Leica, and feel a part of the RFF cult, so, I am still here. I guess there are other internet resources that cater to more mainstream tastes, but I don't feel I belong there.
2) The second explanation may have to do with what we call "Social Desirability Bias". It turns out we may not answer a question honestly, just in order to look good in front of peers. Those among us who are in social sciences should be well-introduced to the subject. It happens in all surveys and even in elections, and it is pretty difficult to get rid of. If the vote is anonymous, the observed bias is normally of smaller magnitude, but it may still continue to exist because we may like our community to look good in the eyes of the community members (probably not even consciously).
Furthermore, people have a memory bias towards what makes them feel good, or what is inline with their norms and values. If we consider shooting film as a prestigious norm or much-revered value in this forum (doesn't even need a proof!), one can argue that having internalized this norm, most forummates have a memory bias towards remembering themselves shooting film, or only considering their film shooting as their serious work.
Anyway, I am in the 30-39 category and I responded mostly film, because I have just sold my digicam. For now I am into practicing with this "new" old medium that is film.
Cheers!