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.
Possession on legal rights-ability to make your own decisions independently and stand responsible for those in the eyes of law. Person must reach certain age to be legally independent, which is in most countries 18 years of age, and have complete mental competence.