18. simply because its the age at wich you are legally an adult and can vote drink get married etc.

its not a case of being greedy or age discrimination. you have to give something for kids to do illicitly or there wouldn't be any rules to break!

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"The illusion of freedom will continue as long as it's profitable to continue the illusion. At the point where the illusion becomes too expensive to maintain, they will just take down the scenery, they will pull back the curtains, they will move the tables and chairs out of the way and you will see the brick wall at the back of the theater" - Frank Zappa, musician and cultural iconoclast