Youths and Adults

What is meant by the terms youth and adults. They are different, one may say that adults are people over 18 who have responsibilities that can not be avoided or it might be they have different interests to those people who are youths. Dictionary definition of youth can be found at http://www.thefreedictionary.com/Youth  a more detailed and analytical discussion can be found at http://www.answers.com/topic/youth

Adults while generally considered from a legal point of view to be people over 18, from a social perspective it is not necessarily so simple, a quite detailed discussion can be found at http://www.answers.com/topic/adult