precocious
adj.having or showing more knowledge, skill, or maturity than people of your age usually have. You use this to describe a child who is very smart or an adult who acts younger than they are.
adj.possessing or exhibiting advanced knowledge, skill, or maturity beyond what is typical for one's age. Often used to describe children with exceptional intellectual development or adults who display childlike behavior.
“The precocious child could read at a very young age.”
“Her precocious nature allowed her to grasp complex scientific concepts that most of her peers found difficult.”
“While some critics dismissed his precocious style as a mere imitation of older masters, others argued it represented a genuine breakthrough in modern art.”
“Over time, Gozo emerged as an option at right wing-back offering precocious confidence on the ball, capping his first full season with RSL with four goals and three assists in 1,810 minutes.”
“When Anselm discovered his proof, he was still a precocious young monk in the quiet of a monastery.”
From Latin praecox (“premature, precocious, ripe before time, early ripe”), from praecoquō (“to ripen beforehand, ripen fully, also boil beforehand”), from prae (“before”) + coquō (“to cook, boil, ripen”). Doublet of apricot.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.