To address that challenge, Ofcom has - in addition to traditional forms of ID - recommended four methods that it says would be "highly effective" at gauging people's ages: photo ID matching, where relevant information on a photo ID document such as a passport is checked against a live image taken during an age check banking-based checks, which involves using the information a financial institution has on record regarding a user's age face age estimation technology (which the regulator argues has recently improved) digital ID services, which enable people to digitally prove who they are or provide information about themselves, such as their age.