Well, personally I don't think 10, 11, 12 or probably even 13 year olds can consent to sex so I think below 10 is pretty young of a cut off age to consider something 'CP' instead of 'Who the fuck cares'. I do think that everyone has the right to view/copy CP though, I am against censorship and for personal freedom. I know that the majority of people are emotionally charged and irrational, but I am quite certain that CP being legal to view and possess would be a good thing and probably would actually lead to lower rates of sexual abuse. Free information means free  information, if you are not for free information then you are pro-censorship. I am the opposite of pro-censorship. Outlawing information is bullshit. And actually CP is about teenagers having sex, because a tremendous amount of CP is in fact teenagers having sex. A tremendous amount of CP that isn't teenagers having sex is Russian produced softcore images where the children are paid and "consent" and have the consent of their parents, however I do think this production should be illegal. A tremendous amount of real CP is no worse than the legal based on artistic merits Brooke Shields nude images: http://www.telegraph.co.uk/news/celebritynews/6244330/Brooke-Shields-nude-photograph-causes-controversy-at-Tate-exhibition.html or nudist images deemed legal by the courts.

I wont link to them because they are nude and underage, but they are legal and actually on exhibit in museums in the UK.

edit: I should mention that I do think paying for CP should be illegal, as this does actually fund child abuse. Saying it is illegal to look at a picture though? Bullshit. Also, my distinction between 'CP' and 'Who gives a fuck' still stands.