user_age_range
The
user_age_range permission allows your app to access a person's age range as listed in their Facebook profile. The allowed usage for this permission is for apps that are legally required to be age-gated and if that app contains content not suitable for the general Facebook user base, for example dating, violent or mature content. You may also use this permission to request analytics insights to improve your app and for marketing or advertising purposes, through the use of aggregated and de-identified or anonymized information (provided such data cannot be re-identified).