@Gin-and0 @Mark116
Is it an inquiry or a request to book? If an inquiry, you can add to @Ann72 's suggestion "Since Airbnb punishes hosts who decline or do not respond to inquiries, I'm pre-approving yours with the stipulation that only adults will check in. I understand this does not meet your requirements, so please just allow the pre-approval to expire." If a booking request, you can say, "Since Airbnb punishes hosts who decline or do not respond to booking requests, I request that you cancel yours. Alternatively, I can accept it with the stipulation that only adults will check in, and then, since that does not meet your requirements, you will have 48 hours to cancel penalty-free."