He seems to be a horrible person who’s done heinous things, but he’s not accused of being a pedophile (except on Twitter). Words have actual meanings, and using ones like pedophile outside their proper meaning reduces their value and impact.
>Leigh Corfman told the Washington Post that she met Moore in 1979 when she was just 14 years old. The then-district attorney offered to watch Corfman while her mother attended a custody hearing, she said, and he asked for her phone number when he was alone with her. Corfman said that days later, Moore drove her to his house and kissed her.
http://time.com/5029172/roy-moore-accusers/
Your (and the author of that op-ed) opinion and my opinion of the definition of "child" differ greatly.