California Code, Civil Code - CIV § 1798.502

(a) With respect to a device for which account setup was completed before January 1, 2027, an operating system provider shall, before July 1, 2027, provide an accessible interface that allows an account holder to indicate the birth date, age, or both, of the user of that device for the purpose of providing a signal regarding the user's age bracket to applications available in a covered application store.

(b) If an application last updated with updates on or after January 1, 2026, was downloaded to a device before January 1, 2027, and the developer has not requested a signal with respect to the user of the device on which the application was downloaded, the developer shall request a signal from a covered application store with respect to that user before July 1, 2027.