Bookinglayer calculates the Guest's age through the Birthday field. The birthday field can be found on the Booking Form, the Booking Manager URL and the individual guest profiles in your backoffice.
Here is how your Guest age is received or adjusted:
1. Click on the Customers module on the left side menu.
2. Select the Guests tab.
3. Open the selected Guest detail by clicking on the Open button or the highlighted guest name.
4. Enter or update the Birthday field.
5. Save your changes.
Booking Manager URL
Your guests can fill out the age field through the Booking Manager URL. Here the guest has the option to enter Birthday details and any other relevant information. See an example of the Booking Manager URL in the screenshot below:
Refer to this article in case you want to know more details about how to send the Booking Manager URL.