An '''adult''' is a [[human being]] 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]].
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An '''adult''' is a [[human being]] 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 [[United States]], and many other nations, this is eighteen, the age at which one is entitled to [[vote]].