It is not as if we might be mistaken in thinking that a four-year-old has knowledge but that no one-year-old does, any more than we might be mistaken in taking the statute’s word for the fact that eighteen-year-olds can marry freely whereas seventeen-year-olds cannot. It may be injudicious to take the prattle of certain four-year-olds seriously, just as it may have been injudicious to have set the age of legal responsibility so low, but no greater understanding of how knowledge (or responsibility) “works” will decide such matters.

