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.
Age of consent reform
In the United States, many states have adopted close-in-age exemptions. These laws, known as "Romeo and Juliet laws" provide that a person can legally have consensual sex with a minor provided that he or she is not more than a given number of years older, generally four years or less. Some Romeo and Juliet laws (such as the law in Michigan and Florida) do not make it legal for a person below the age of consent to have sex with a slightly older person, but may exempt the older partner from sex offender registration.