I do not understand where you are deriving the context of age as being the defining mechanism for when an individual can make sovereign decisions Let me ask you something: when can a CurrentUser make sovereign decisions on a computer. When the current user is smart enough to bypass the restricted authorization access on their terminals programmed Execution Policy. When a human can do that on their own internal hardware sys, they probably have enough autonomy and decision making ability to participate in a free and agorist society without self or societal imposed limits. 18 years on the Roman calendar may or may not be a demographic overlap for that individual