I'm not so sure I agree with that rating. I do try to keep the language clean as a general policy, but certain of the topics I touch upon from time to time are not ones I'd personally consider to be appropriate for children. For example, in my post last week entitled "My $0.02 on the whole 'Bloggers Against Theocracy' Thing", I mentioned abortion, homosexuality, contraception, euthanasia, and physician-assisted suicide. If I were aiming for an all-ages audience in my blogging, I would not include references to these controversial adult issues.
If I were to label my blog, I would give it a "PG- Parental Guidance Suggested" for the occasional mature themes.