California's Digital Age Assurance Act (AB 1043), signed by Governor Gavin Newsom in October 2025, requires every operating system provider in California to collect age information from users at account setup and transmit that data to app developers via a real-time API, with the law taking effect on January 1, 2027.
California introduces age verification law for all operating systems, including Linux and SteamOS — user age verified during OS account setup
AB 1043 also requires OS providers to pipe a real-time age checker to every app developer who requests it.