I work with him and e likes me and I like him too but I'm not sure how old he is and there really isn't a way to tell if we've had sex so how could I go to jail? It really depends on the state you live. I found out a few months ago that the age of legal consent is 16 in the state I live in. Check the internet to find the law in your state before you go any further. You may be worrying about nothing. It doesn't matter if you know his age or not.