Hui245 No none under 18 should be able to book or possibly under 25 ,ask the guest for a copy of their ID because it will clearly not be theirs I suspect. ..just send a message to say ,you will not be able to accept IB on this occaison as you have become aware that the person on the reservation and making the booking is under age. spell it out in the messaging before you send the cancellation and explain . as CS will only have the messaging to go on . and them send C>S a message to say that you cancelled ...details.... for the ...following reason and do not expect a penalty.....H