"This actually seems to be moving in the other direction..."
That's not supported by the link you provided. That page says they're 'about as likely'. If it were moving in the other direction, it would instead say 'more likely'.
Moreover, the last sentence you quoted gets that info from a paper[0] which found no significant correlation of attitudes with age.
Even if it had found any correlation, the manner in which the survey was conducted wouldn't demonstrate that GP in incorrect. 99% of survey participants had graduated high school. It sounds like, though the authors claim the survey participants reflected the mix in the 2000 census, they've restricted their analysis to adults (18+ ?).
That's not supported by the link you provided. That page says they're 'about as likely'. If it were moving in the other direction, it would instead say 'more likely'.
Moreover, the last sentence you quoted gets that info from a paper[0] which found no significant correlation of attitudes with age.
Even if it had found any correlation, the manner in which the survey was conducted wouldn't demonstrate that GP in incorrect. 99% of survey participants had graduated high school. It sounds like, though the authors claim the survey participants reflected the mix in the 2000 census, they've restricted their analysis to adults (18+ ?).
So it says nothing about what teenagers think.
[0] http://www.people.hbs.edu/mnorton/norton%20sommers.pdf