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Australia, New Zealand & United Kingdom
The coming of age in Australia, New Zealand and the United Kingdom is celebrated either at 18, which is the legal age of majority, or at 21, the traditional age. Eighteenth birthday parties are becoming increasingly common. Turning 21 has few effects legally, whereas 18 is the age of legal majority it is the age to vote, drink, gamble, get married without parental consent (can marry at 16 without parental consent in Scotland), sign contracts etc. Celebrations typically take the form of a particularly extravagant birthday party; presents given are often higher than usual value, and champagne may be served, as at other formal celebrations. If the celebrant is a male he may be forced to consume a yard glass which is typically full of beer. But apart from this little to no set ceremony or ritual is observed. However there is a growing trend towards Adolescence Ceremonies that celebrate the coming of age with a display of transitional objects such as teddy bears that are officially packed away after the ceremony. During the ceremony an explanation of rights and obligations may be explained to the new adult to assist a smoother transition into adulthood for themselves and their family.
Drinking plays a large part in Australian 18th birthdays, as it is the age where one can legally drink. As such, many 18th birthdays are celebrated with a large party with friends, with drinking as a central motif. These gatherings are often loud, and it is customary for the birthday boy/girl to drink more then they otherwise should. Despite 18 being the legal age of adulthood, many Australians do not immediately take on the roles of adult, such as moving out of home or gaining full-time employment, instead studying or working as an apprentice. This accounts for the distinction between the atmospheres and objectives of 18ths and 21sts. 18ths being drinking, and 21sts being a more transitional and reflective celebrations. At Australian 21sts, it is customary for parents and siblings to assemble embarassing photos, videos, voice recordings or other childhood memorabilia to display at a celebration.
http://en.wikipedia.org/wiki/Coming_of_age