Child ages

Is it possible to limit the age of a child.   Our space lends itself to couples with a child but we want to limit the child age to be a maximum of 13 - so children ages 14-18 are not allowed.   Can we do this?  We have good reason to do this as we have found guests incorrectly specifying a child's age and we then end up with 3 adults - which we do not allow.