Precocious

{pri-ˈkō-shəs}

  1. exceptionally early in development or occurrence
  2. exhibiting mature qualities at an unusually early age

Examples of precocious in a sentence:

  • The precocious player earned his spot on the squad when he was in third grade.
  • I was a precocious child who at the age of four was already discussing the daily news with my parents.