What is the legal term for someone who has not reached the age of majority?

The term "Minor" refers to an individual who has not yet reached the age of majority, which is the legally defined age at which a person is recognized as an adult and can assume full legal responsibility for their actions and decisions. This age can vary by jurisdiction but is typically set at 18 in many places. Minors have certain legal limitations, such as the ability to enter into contracts or make certain medical or financial decisions, which are often made on their behalf by parents or guardians.

In contrast, the other terms do not carry the same legal connotation regarding age. An "Adult" refers to someone who has reached the age of majority, thus holding full legal rights. A "Custodian" typically refers to a person who is responsible for the care of someone else, often in a legal or formal context, especially relating to the care of minors but does not directly pertain to the age classification. A "Guardian" is an individual who is legally appointed to take care of the personal and/or property interests of another person, usually a minor, but again does not define the age of the person in question.