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In law, a minor is a person under a certain age—usually the age of majority—which legally demarcates childhood from adulthood. The age of majority depends upon jurisdiction and application, but is generally 18. Minor may also be used in contexts unconnected to the overall age of majority. For example, the drinking age in the United States is 21, and people below this age are sometimes called minors even if they are older than 18. The term underage often refers to those under the age of majority, but may also refer to persons under a certain age limit, such as the drinking age, smoking age, age of consent, marriageable age, driving age, voting age, etc. These age limits are often different than the age of majority.
The concept of minor is not sharply defined in most jurisdictions. The ages of criminal responsibility and consent, the age at which school attendance is no longer obligatory, the age at which legally binding contracts can be entered into, and so on, may be different.
In many countries, including Australia, India, Philippines, Brazil, Croatia and Colombia, a minor is defined as a person under the age of 18. In the United States, where the age of majority is set by the individual states, minor usually refers to someone under the age of 18, but can in some states be used in certain areas (such as gambling, gun ownership and the consuming of alcohol) to define someone under the age of 21. In the criminal justice system in some places, "minor" is not entirely consistent, as a minor may be tried and punished for a crime either as a "juvenile" or, usually only for "extremely serious crimes" such as murder, as an "adult".
In Japan, Taiwan, Thailand, and South Korea, a minor is a person under 20 years of age. In New Zealand law, a minor is a person under 20 years of age as well, but most of the rights of adulthood are assumed at lower ages: for example, entering into contracts and having a will are legally possible at age 15.
For all provincial laws (such as alcohol and tobacco regulation), the provincial and territorial governments have the power to set the age of majority in their respective province or territory, and the age varies across Canada. Alberta, Manitoba, Quebec, and Prince Edward Island have the age set at 18, while in British Columbia, Ontario, Yukon, Northwest Territories, Nunavut, Newfoundland, Nova Scotia, and New Brunswick the age of majority is 19. Saskatchewan legal gaming age is 19 while Saskatchewan's legal drinking age is 19.
For Federal Law (Criminal Code, Voting, etc.), the age of majority is 18.
In Italy, law nr. 39 of March 8, 1975, states that a minor is a person under the age of 18. Citizens under the age of 18 have no right to vote (to vote for senate must be at least 25) and be elected in political elections, are not allowed to obtain a driving license for automobiles nor issue or sign legal instruments. Crimes committed in Italy by minors are tried in a juvenile court.
The Civil and Commercial Code of the Kingdom of Thailand does not define the term "minor"; however, sections 19 and 20 read as follows:
- Section 19 – A person, on completion of 20 years of age ceases to be a minor and become sui juris
- Section 20 – A minor becomes sui juris upon marriage, provided that the marriage is made in accordance with the provisions of Section 1448
Hence, a minor in Thailand refers to any person under the age of 20, unless he or she is married. A minor is restricted from doing juristic acts—for example, sign contracts. When a minor wishes to do a juristic act, he has to obtain the consent from his legal representative, usually (but not always) the parents and otherwise the act is voidable. The exceptions are acts by which a minor merely acquires a right or is freed from a duty, acts that are strictly personal, and acts that are suitable to the person's condition in life and are required for their reasonable needs. A minor can make a will at the age of fifteen.
In England and Wales and in Northern Ireland a minor is a person under the age of 18; in Scotland, under the age of 16. The age of criminal responsibility in England and Wales and in Northern Ireland is 10; and 12 in Scotland, formerly 8, which was the lowest age in Europe.  
Things that persons under 18 are prohibited from doing include sitting on a jury, voting, standing as a candidate, buying or renting films with an 18 certificate or R18 certificate or seeing them in a cinema, being depicted in pornographic materials, suing without a litigant friend, being civilly liable, accessing adoption records and purchasing alcohol, tobacco products, knives and fireworks. The rules on minimum age for sale of these products are frequently broken so in practice drinking and smoking takes place before the age of majority; however many UK shops are tightening restrictions on them by asking for identifying documentation from potentially underage customers.
Driving certain large vehicles, acting as personal license holder for licensed premises, and adopting a child are only permitted after the age of 21. The minimum age to drive a HGV1 vehicle was reduced to 18. However, certain vehicles, e.g., steamrollers, require that someone be 21 years of age to obtain an operating license.
In the United States as of 1995, minor is legally defined as a person under the age of 18, although 21 with the context of alcohol; people under the age of 21 may be referred to as "minors". However, not all minors are considered "juveniles" in terms of criminal responsibility. As is frequently the case in the United States, the laws vary widely by state.
Under this distinction, those considered juveniles are usually tried in juvenile court, and they may be afforded other special protections. For example, in some states a parent or guardian must be present during police questioning, or their names may be kept confidential when they are accused of a crime. For many crimes (especially more violent crimes), the age at which a minor may be tried as an adult is variable below the age of 18 or (less often) below 16. For example, in Kentucky, the lowest age a juvenile may be tried as an adult, no matter how heinous the crime, is 14.
In most states, juveniles may not be incarcerated with adult inmates, even if the child is charged as an adult. This is also discouraged by the federal government, which prefers funding only if children and adults are housed in separate facilities.
The death penalty for those who have committed a crime while under the age of 18 was discontinued by the U.S. Supreme Court case Roper v. Simmons in 2005. The court's 5–4 decision was written by Justice Kennedy and joined by Justices Ginsburg, Stevens, Breyer, and Souter, and cited international law, child developmental science, and many other factors in reaching its conclusion.
The twenty-sixth amendment to the U.S. Constitution, ratified in 1971, granted all citizens the right to vote in every state, in every election, from the age of 18.
The U.S. Department of Defense took the position that they would not consider "enemy combatants" held in extrajudicial detention in the Guantanamo Bay detainment camps minors unless they were less than sixteen years old.[verification needed] In any event, they only separated three of more than a dozen detainees under 16 from the adult prison population. Several dozen detainees between sixteen and eighteen were detained with the adult prison population. Now those under 18 are kept separate, in line with the age of majority and world expectations.
Some states, including Florida, have passed laws that allow a person accused of an extremely heinous crime, such as murder, to be tried as an adult, regardless of age. These laws, however, have been challenged by the American Civil Liberties Union. An estimated 250,000 youth are tried, sentenced, or incarcerated as adults every year across the United States.
- Age of Majority Table
- Youth Criminal Justice Act
- "Italie". Wipo Lex. Retrieved 7 September 2012.
- Family Law Reform Act 1969, section 1
- Age of legal capacity, Scotland 1991
- [Gaines, Larry K and Roger Leroy Miller. "Criminal Justice in Action" 4th ed., Thompson Wadsworth Publishing, 2007. Pg 495]
- Roper v. Simmons (No. 03-633) | LII / Legal Information Institute
- Campaign for Youth Justice, Key Facts: Youth in the Justice System. Washington, D.C.: Campaign for Youth Justice, 2007. Web. May 2011. Citing Woolard, J. “Juveniles within Adult Correctional Settings: Legal Pathways and Developmental Considerations.” International Journal of Forensic Mental Health 4.1 (2005):http://www.campaignforyouthjustice.org/documents/KeyYouthCrimeFacts.pdf