I do not understand this.. we already have to provide legal Identification for a phone number... simply assume child unless telco verified its a adult... downside cant sell adverts to lots of people and telcos want paying (telco part easy to solve as could be part of universal mobile obligation)

only problem is the gaming of the systems first of all you have compiler optimisations and secondly clocks... Both lie and cheat.. huge incentives to do so, like HUGE... compare the assembly between an intel compiler and GCC with base settings now compare it to ARM and SPARC... clocks lie.. #IEEE754