Wiki Age Demographics

Was just wondering about the age ranges of people who contribute to wikis.

Brief discussion here:
http://nonbovine-ruminations.blogspot.com/2007/03/demographics-of-wikipedia.html
which says that there's no way to find out.

Poll done by wikipedia here:
http://meta.wikimedia.org/wiki/List_of_Wikimedians_by_age which shows most of contributors born in the 70s-80s. Post from above says that this poll is unreliable b/c it's self selected.

Will keep looking....