To drink? Or not to drink? That is the question.
Okay, if you reference the Hamlet speech, you have to be clever by making your speech parallel some of the meaning of his. Can you analyze his speech closely and make your speech "mirror" some of the lines or themes? Rather than just using the title (arbitrarily), you can use the same concepts he uses.
Also, I think your ideas are funny but you will have trouble completing it if you are actually arguing an idea that is incorrect! Drinking causes illness, pain, alienation, accidental death. It is not correct to simply say it is fun. So, even if you think we can lower the drinking age like other countries do and see fewer people with drinking problems, or... whatever strong arguments you can make, I think the essay has to come around at the end to finally acknowledging that there is plenty of time for drinking aver brain development has been completed. (Your point about brain development is funny! But clearly, it is not a serious argument, so I think you should complete this by making is a sarcastic argument in favor of abstaining until one reaches the legal age.)
:-)