precocious

Adjective
  1. Characterized by or characteristic of exceptionally early development or maturity (especially in mental aptitude) (synset 301845744)
    "a precocious child"; "a precocious achievement"
    also: intelligent - having the capacity for thought and reason especially to a high degree
    similar to: advanced - farther along in physical or mental development
  2. Appearing or developing early (synset 300822620)
    "precocious flowers appear before the leaves as in some species of magnolias"
    referred to in: botany, phytology - the branch of biology that studies plants
    similar to: early - being or occurring at an early stage of development

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