## **Core Concept**
The Juvenile Justice Act is a law that governs the treatment of children in conflict with the law or in need of care and protection. The Act specifies a particular age range for a child to be considered a juvenile. The age of juvenile is crucial in determining the jurisdiction and the type of rehabilitation or punishment.

## **Why the Correct Answer is Right**
The correct answer states that according to the Juvenile Justice Act, the age of a juvenile is 18 years. This is because the Juvenile Justice (Care and Protection of Children) Act, 2015, defines a juvenile or a child who has not completed eighteen years of age. This Act aims to consolidate and amend the law relating to juveniles in conflict with law and children in need of care and protection.

## **Why Each Wrong Option is Incorrect**
* **Option A:** 16 years - This age is below the defined age of a juvenile according to the Juvenile Justice Act.
* **Option B:** 21 years - This is above the defined age and relates more to the legal age of adulthood.
* **Option D:** 14 years - This is also below the defined age and might relate to different legal or educational contexts.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the Juvenile Justice Act of 2015 raised the age of a juvenile from 16 to 18 years. This change impacts how cases involving minors are handled legally.

## **Correct Answer:** D. 18 years.