Earlier quoted context omitted.
Yet then again how hard is it to just grab your parents' ids while they're not looking and add it to your phone wallet?
Gate it in the touch id secure enclave. Then only the biometrics of the adult can provide the proof that they are over 18.
Unless of course they're planning on making us go to some facility to ensure our phones get the digital components of the IDs get loaded into the secure enclave? Which sounds dystopian as heck given the scenes coming out of the US right now.