Precocious

Part of speech: adjective (a.)

1. Ripe or mature before the proper or natural time; early or prematurely ripe or developed; as, precocious trees. [R.] Sir T. Browne.

2. Developed more than is natural or usual at a given age; exceeding what is to be expected of one's years; too forward; -- used especially of mental forwardness; as, a precocious child; precocious talents.