Definition of mutism. : the condition of being unable to speak whether from physical, functional, or psychological cause.
Adolescents rushing to become adult have pushed the government reconsider the age of responsibility. Therefore, 21 is the age of responsibility taking account: decision making, impulse control and maturity. To begin with, the age of responsibility is defined by a persons decision making. Poor decisions at times lead teenagers to more dangerous/complicated situations.
1 The age will differ for every child, so don't force the issue if he's clearly not ready.  Working for More: Age 7 and up. Experts advise against tying allowance to household chores, behavior, or grades (as an award or punishment). Doing so makes it a disciplinary tool rather than a teaching tool.