@Helen744
It should be as simple as that, but it's not. As a host who does not accept children, I totally understand what @Jennie131 is saying about guests becoming hostile.
Before I switched to long term hosting, I would often have people requesting to book with children (sometimes also bringing their guest count to over my maximum), even though it was clearly stated in my house rules that I don't accept under 18s.
As we know, many guests do not read the listings/house rules. You would think that when you point out that unsuitable for children is stated on the listing that they would simply respond, "Oh sorry, my mistake. I didn't notice that. No problem, I'll withdraw the request." However, the majority don't.
Instead, they try to twist your arm and it's usually something along the lines of, "But MY child is very well behaved/mature/an angel." They basically want you to disregard your rules because their child is always the exception. When you won't, they get very upset, as if you have said something nasty about their child, which is of course not the case.
I've had one guest who repeatedly tried to book for herself and two teens (even though the max occupancy was for two guests). When I told her that my other guests booked their rooms on the assumption that there would be no children in the house (the point that usually worked with others wanting to bring their kids), she responded that one was nearly 18 anyway and that the other was tall, "So no one will notice." As if that's the point! My rules about children/maximum number of guests were irrelevant to her. Some people simply want want they want and your rules are meaningless.
Another lady basically told me that there was something wrong with me and that I must be some sort of twisted person if I didn't like children. I never said I don't like children. I do. That's not relevant. The rule is there for several practical reasons, as is the rule about no pets. That doesn't mean I hate children and animals!
