I would like to see details of all guests listed on the booking (with agest of those under 18).
Response from Airbnb
Today when a guest books we require guests to tell you how many guests are coming, and we recently improved this by requiring guests to tell you how many children and infants are coming as well (you can always state that your listing is not suitable for children or infants). We also require guests to tell you the purpose of their trip at time of booking. We currently encourage guests to submit the names of each guest that is coming, but do not currently require it.
Follow up from Airbnb - May 26th, 2017
At this time we’re not going to make it a requirement that guests provide identity details for every person in their party, including ages of those under 18 years old. However, as a host you can indicate in your House Rules that guests booking your home must provide certain details, including the ages of those under 18 years old.
When guests book your home, they must explicitly agree to your House Rules. This is true whether your listing is Instantly Bookable or not. As a host you may decline a reservation request, or cancel a reservation, if you feel that the guest is not be able to follow your house rules.