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.
Maturity (psychological)
While maturity is often termed as a label awarded to a child, research has revealed that children themselves hold a clear sense of their own autonomy and personal jurisdiction. For instance, American elementary-aged school children demonstrated an acknowledgement of the limits of their parents' authority over their choice of dress, hairstyle, friends, hobbies, and media choices. But this constrained earlier concept of personal autonomy later develops into a broader understanding of individual freedoms, with an understanding of freedom of speech as a universal right emerging by elementary school age. However, younger children do have difficulty with maintaining a consistent view on universal rights, with 75% of first-grade children expressing uncertainty about prohibiting freedom of speech in Canada. But this same study also found that 6- to 11-year-old Canadian children rejected nondemocratic systems on the basis of violating principles of majority vote, equal representation, and right to a voice, which provides evidence for an emerging knowledge of political decision-making skills from a young age.