13. A computing-device implemented method, comprising: providing, by an age verification server, a query to a user, receiving, by the age verification server, voice data from the user responsive to the query, performing, by the age verification server, voice recognition on the voice data to identify a query answer, calculating, by the age verification server, a confidence score associated with the query answer, wherein the confidence score represents the likelihood that the query answer has been accurately identified, and determining, by the age verification server, a likely age range associated with the user based on the confidence score, wherein the voice recognition is performed in a manner to increase a likelihood of recognition of voice data for a particular age range of callers.
15. The computing-device implemented method of claim 13 , further comprising: determining, by the age verification server, a correctness of the query answer, and determining, by the age verification server, the likely age range associated with the user based on the confidence score and the correctness of the query answer.