I'm scared.................what should i do?

I got this message from this guy on a website that was supposed to be safe and all, and he said that we should chat and I was like hmm well okay sure why not and he said that he would **** me if I wanted and I was like ummmm idc and he said later in the conversation that he's done them as early as 4 years old and its just awful that someone could do that, and I mean I know I should have flat out said **** no but he didnt bring it up exactly as fast as I said he just asked me if I was seriously as old as I said.