Registering as love offender is a bad thing. You can't be a teacher, police officer, doctor, fireman, or hold office. Every time you move to new house you have to inform the local police department where you live. Also many employers probably won't hire him.
However I have my doubts since he is still considered a child by law. Also was he arrested, taken to jail, then to court where an expert proved that he had the mind of an adult and the prosecution gave enough evidence to the jury to convince that he was guilty enough to be charged as an adult?