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The 1804 dollar belongs to the rarest and most valuable American coins. Proof coin sets, including the dollar, were created for use as diplomatic gifts carried by envoy Edmund Roberts on his trips to Siam and Muscat. Though the dollars are dated 1804, none were struck until the 1830s; the earlier date was a mistake in accordance with misunderstood U. S. Mint records from 1804. Later, Mint officials struck some of the coins to trade with collectors in exchange for rare coins needed for the Mint's coin cabinet. In response to numismatic demand, Mint officials surreptitiously produced several coins, one of which lacked the correct edge lettering. The coins produced in the diplomatic mission, the dollar struck without edge lettering and the later examples with lettering are known as "Class I", "Class II" and "Class III" dollars, respectively. Altogether, only fifteen specimens are known to exist, and in 1999, one sold for $4. 14 million, the highest price paid for any coin close to that time. These coins have been frequent targets of counterfeiting and other deceptions.

Legal adulthood

Lawfully, adulthood means that one can engage in a contract. The same or a different minimum age may be applicable to, for example, parents losing parenting rights and duties regarding the person concerned, parents losing financial responsibility, marriage, voting, having a job, serving in the military, buying/possessing firearms (if legal from all), driving, traveling abroad, involvement with alcoholic beverages (if legal at all), smoking, sexual activity, gambling (if legal at all), being a prostitute or a client of a prostitute (if legal at all), being a model or actor in pornography, running for President etc. Admission of a young person to some place may be restricted because of danger for that person, concern that the place may lead the person to immoral behavior, and/or because of the risk that the young person causes damage (for example, at an exhibition of fragile items).

One can distinguish the legality of acts of a youthful person, and of enabling a young person to carry out that act, by selling, renting out, showing, permitting entrance, participating, etc. There may be distinction between commercially and socially enabling. Sometimes there is the requirement of supervision by a legal guardian, or just by an adult. Sometimes there is absolutely no requirement, but just a recommendation.

With regard to pornography one can distinguish:

being allowed inside an adult establishment
being allowed to purchase pornography
being allowed to possess pornography
another person being allowed to sell, rent out, or show the young person pornography, see disseminating pornography to a minor
being the pornographic actor: rules for the young person, and for other people, regarding production, possession, etc. (see child pornography)
With regard to films with violence, etc.:

another person being allowed to sell, rent out, or show the young person a film, a cinema being allowed to let a young person key in
The legal definition of entering adulthood usually varies between ages 16–21, depending on the region in question. Some cultures in Africa[clarification needed] define adult at age 13.

According to Jewish tradition, adulthood is reached at age 13 (the minimal age of the Bar Mitzvah or Bat Mitzvah) for Jewish boys as well as girls; they are expected to demonstrate preparation for adulthood by learning the Torah and other Jewish practices. The Christian Bible and Jewish scripture has no age requirement for adulthood or marrying, which includes engaging in sexual activity. The 1983 Code of Canon Law states, "A man before he has completed his sixteenth year old, and likewise a woman before she has completed her fourteenth year of age, cannot enter a valid marriage". [6] According to The Disappearance of Childhood by Neil Postman, the Christian Church of the Middle Ages considered the age of accountability, when a person could be tried and even executed being an adult, to be age 7.

In most of the world, including most of the United States, parts of the United Kingdom (England, Northern Ireland, Wales), India and China, the legal adult age is 18 for most purposes, with some notable exceptions:

Biological adulthood

In the past and cross-culturally, adulthood has been determined primarily by the start of puberty (the appearance of secondary sex characteristics such as menstruation in women, ejaculation in men, and pubic hair in both sexes). In the past, a person usually moved from the status of child directly to the status of grownup, often with this shift being marked by some type of coming-of-age test or ceremony. [1]
After the social construct of adolescence was created, adulthood split into two forms: biological adulthood and social adulthood. Thus, there are now two primary forms of adults: biological adults (people who have attained reproductive capability, are fertile, or who evidence secondary sex characteristics) and social adults (people who are recognized by their culture and/or law as being adults). Depending on the context, adult can indicate either definition.

Although few or no established dictionaries provide a definition for the two word term biological adult, the first definition of adult in multiple dictionaries includes "the stage from the life cycle of an animal after reproductive capacity has been attained". [2][3] Thus, the base definition of the word adult is the period beginning at puberty. Although this is the primary definition of the base word adult, the two word term biological adult stresses or clarifies that the original description, based on the beginning of puberty, is being used.

Puberty generally begins around 10 or 11 years of age for girls and 11 or 12 years of age for boys, though this will vary from person to person. [4][5] Because the term adult is most often used without the adjective interpersonal or biological, and since the term is frequently used to refer to social adults, some writers have taken the meaning of the two word phrase biological adult to begin at the end of physical maturation rather than the onset of puberty.

Adult

Biologically, an adult is a human being or other organism that has reached sexual maturity. In human context, the term adult additionally has meanings associated with social and legal concepts. In contrast to a "minor", a legal adult is a person who has attained the age of majority and is therefore regarded as independent, self-sufficient, and responsible.
Human adulthood encompasses psychological adult development. Definitions of adulthood are often inconsistent and contradictory; a person may be biologically an adult, and have adult behavior but still be treated as a child if they are under the legal age for majority. Conversely, one may legally be an adult but possess none of the maturity and responsibility that may define an adult character.