Creates the Digital Age Assurance Act. Provides that specified manufacturers shall take commercially reasonable and technically feasible steps to, upon activation of a device, determine or estimate the age of the device's primary user and provide websites, applications, application stores, and online services with a digital signal regarding the user's age. Sets forth requirements for any website, application, or online service that makes available mature content. Provides that a website, application, or online service with actual knowledge that a user is under 18 years of age shall, to the extent commercially reasonable and technically feasible, provide readily available features for parents or guardians to support a minor with respect to the minor's use of the website, application, or online service. Provides that specified manufacturers shall comply with the Act in a nondiscriminatory manner. Provides that the Attorney General may commence a civil action to enforce the provisions of the Act. Sets forth provisions concerning civil actions. Limits home rule. Effective January 1, 2026.