male and female restrooms. The age of the person doesn't matter. It's a "cute" way to ask, "Where is the toilet?" It's thought to be "nicer" than to say, "I need to use a toilet. Where is it?"
I haven't heard anyone use the term "little girls room" or "little boys room."
It's best to ask, "Where is the rest room?" or "Where are the toilets?"
I've heard adults use the terms "little girls room" and "little boys room." I find it silly -- demeaning, actually. The terms are appropriate for children's rest rooms, such as in elementary schools, but they are not appropriate for teenagers or adults.
To determine if the person is looking for the restroom specifically for little boys or girls, you can ask for clarification by saying, "Are you asking for the restroom specifically for little boys or girls, or are you looking for the restroom for all male or female persons?" This will help you provide more accurate and helpful assistance.
