This border is less arbitrary than birth. I am not sure if this is what nazgulnarsil intended, but I think the ability to understand death creates a natural barrier because at this point one’s quality of life can suffer from understanding the possibility of euthanasia. Another natural barrier is the ability to have opinions on controversial topics, because at this point someone may want to kill you to suppress your opinions, leading to a suboptimal marketplace of ideas.
This border is less arbitrary than birth. I am not sure if this is what nazgulnarsil intended, but I think the ability to understand death creates a natural barrier because at this point one’s quality of life can suffer from understanding the possibility of euthanasia. Another natural barrier is the ability to have opinions on controversial topics, because at this point someone may want to kill you to suppress your opinions, leading to a suboptimal marketplace of ideas.