An '''adult''' is a human or other creature which has achieved physical and mental maturity. In humans, the age of achieving physical and mental adulthood varies between individuals, but most nations recognise a certain age as being the notional boundary. In the [[UK]], and many other nations, this is eighteen, the age at which one is entitled to vote. | An '''adult''' is a human or other creature which has achieved physical and mental maturity. In humans, the age of achieving physical and mental adulthood varies between individuals, but most nations recognise a certain age as being the notional boundary. In the [[UK]], and many other nations, this is eighteen, the age at which one is entitled to vote. |