Image Recognition
Output of an Artificial Intelligence system from Google Vision, performing Facial Recognition on a photograph of a man, with facial features identified and facial bounding boxes present, San Ramon, California, November 22, 2019. Assuming an adult is detected, they could then grant whatever permissions they feel are appropriate for their children. It would be used by adults, and has to do with a US privacy law, not the ESRB's age ratings for games. (The proposed system sets 25 as the minimum threshold in order to "prevent teenagers or older-looking children from pretending to be a parent." Fair play to all involved, the proposed system doesn't function like a conventional facial rec system, but there's definitely an element of semantics to the ESRB's argument, too.