Query it with Amazon.
Quote:
"We take our responsibility in relation to the sale of age-restricted items extremely seriously. To confirm the recipient is over 18 years, valid photographic ID with a date of birth may be required upon delivery. The driver will input your year of birth into their device and may then require an ID check to complete the age verification process.
The driver will not record any other information, take photographs of your ID document or be able to access your information once the delivery is complete. The year of birth is stored securely in Amazon’s systems in order for us to ensure that any legal obligations with respect to age verification have been met and will be deleted according to our retention policy.
Source:
https://www.amazon.co.uk/gp/help/customer/display.html?nodeId=GV3U7CYQYK5JUPCY