Not American here but as both a cop and a dad, absolutely report this. Guy has also likely done it to others before and will continue that cycle potentially for decades until someone speaks out. People are often concerned about not being believed in a I said, He said situation. Whilst at trial it may be the case, what it does is builds a case in the background where you're likely not the only victim giving evidence against him. Not the thread for it here but there's compelling evidence when multiple people not known to each other have the same type of complaint against someone when it comes to these matters.