In the episode where Declan and Peggy are investigating the case of the young girl who keeps disappearing from her bed at night (Episode #20, "Wonderful"), the little girl's age is given as 9 years old (by various people, including the police and Peggy). Towards the beginning of the episode when Declan's just starting to get involved, he's reading about it in the newspaper. Her age is again given to be nine, but when we see the newspaper article over Declan's shoulder, the opening line states that "a 7 year old girl" disappeared. Hardly worth the effort typing it up, really...