Coming of age
In the United States, teenagers are allowed to drive at 16 in all states except New Jersey, which requires drivers to be 17 and older, and sometimes receive the responsibility of owning their own car. Teenagers may drive at age 15 in Idaho and Montana. At 16, teenagers are also old enough to donate blood and work in most establishments. At 18 one is legally considered an adult and can vote and join the military. The legal age for purchasing and consuming alcohol and recreational marijuana, the latter of which is only legal in the District of Columbia, Colorado, Oregon, Washington, California, Hawaii, Massachusetts, Nevada, and Alaska, is 21. The legal age for purchasing and consuming tobacco products is 18 in most states; 19 in Alabama, Alaska and Utah; and 21 in California, New Jersey, Oregon, Hawaii and Maine. Multiple localities have also raised the minimum purchase age independent of state laws.
Senior (education)
In the United States, the twelfth grade is usually the fourth and final year of a student's high school period and is referred to as his/her senior year. In England and Wales, students in their tenth year and above in Secondary School are seniors; in Scotland, students in their fifth year and above are seniors. In the province of Ontario, high school students in their third year and above are considered to be seniors, while in the province of Alberta, only grade twelves are counted as seniors even though both provinces are Canadian (due to the fact that high school is only grades ten-twelve in Alberta). In the state of Queensland in Australia, senior refers to the final two years of high school.