Ripe or mature before the proper or natural time; early or prematurely ripe or developed; as, precocious trees.
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.
What might be taken for a precocious genius is the genius of childhood. When the child grows up, it disappears without a trace. It may happen that this boy will become a real painter some day, or even a great painter. But then he will have to begin everything again, from zero. Pablo Picasso
I have a fondness for writing about precocious, troubled teenagers, who are alienating, but kind of endearing. It's from remembering so clearly that time in my own life. I experienced myself as more dramatically troubled than I was, but I just remember how it felt. Ann Hood