Is there a law about boys and girls sharing a room it they are not related in New Hampshire if there is dose any budy know what the age is that they can not be in the same room?

I may be wrong but I cannot imagine such a law exists.

There are laws, but as far as I know they are never enforced. I shared a room with at least one of my siblings until I moved out. When they are siblings the age they should have their own room is usually between 6 and 8, I'm not sure about non-relatives though. :)