Which term is used to denote exhibiting mature qualities at an unusually young age?

The term "precocity" describes the phenomenon of exhibiting advanced abilities or mature qualities at a young age. It comes from the Latin root "praecox," which means "early ripe" or "premature." This word effectively captures the essence of someone who demonstrates intelligence, talent, or emotional maturity that surpasses what is typically expected for their age, thus making it the perfect choice in the context of the question.

In a broader context, precocious individuals might show exceptional skills in areas such as academics, arts, or social interactions, indicating that they are developing faster than their peers. For example, a child who can solve complex mathematical problems or engage in adult-like conversations might be described as precocious.

The other terms do not convey this specific idea. "Sanction" refers to a penalty or a form of approval, "unbridled" means uncontrolled or lacking restraint, and "benign" implies a gentle or harmless nature. These words pertain to very different concepts and do not align with the notion of early maturity or advanced development in youth.