The second stage of the human life cycle lasting from about age 12 to 18?

The second stage of the human life cycle, known as adolescence, typically spans from ages 12 to 18. During this period, individuals undergo significant physical, emotional, and cognitive development, transitioning from childhood to adulthood. Key changes include puberty, the development of identity, and increased independence, as well as the formation of deeper relationships and social skills. This stage is crucial for establishing self-concept and preparing for adult responsibilities.