https://developer.android.com/google/play/age-signals/overview
Play Age Signals overview | Android Developers
Use the Play Age Signals API (beta) to retrieve age-related signals, notify Google Play of app changes requiring parental approval, and receive notifications...
signals overviewplayageandroiddevelopers
https://dukespace.lib.duke.edu/items/fbd95fde-30c6-4a4e-ba95-ecccb531bb30/full
Editorial overview: Metabolism of T cells: integrating nutrients, signals, and cell fate
editorial overview