Precocious
Part of speech: adjective
Definition: Characterized by exceptionally early development or maturity. Exhibiting advanced skills at an abnormally early age.
Example sentence: As a precocious teen I dreamed of being Graham Greene. Well, as it turned out, I never wrote a great novel, sadly, and I never converted to Catholicism, happily, but I did do one thing he did. That is, in middle age I moved to a seaside town and got into a right barney with the local powers-that-be.
Early
Part of speech: adjective
Definition: At a time in advance of the usual or expected event.Arriving a time before expected; sooner than on-time.Near the start or beginning.
Part of speech: adverb
Definition: At a time before expected; sooner than usual.
Example sentence: Daffodils, blossom and tulips jostle to the front of the stage in April. I love these early perennials: they may be more modest but they nearly all have that one special quality that a plant needs to transform your affections from admiration to affection - charm.