In short, it's a policy reflecting a nation that has a government that is partially or completely run by children (regardless of whether it is a democracy, autocracy, etc.).
The broader impetus for this is that I would like to build on this policy, exploring some of the interesting foibles and complexities that could arise from making these choices, as well as potentially write more issues that actually have this effect (for example, something that offers a stronger version of choice 4 of Issue#1287).
Potential preexisting examples:
Issue#1287 "Children of the Magna Carta"
Issue#1494 "A Minor Political Problem"