A child prodigy is, technically, a child under the age of 10 who produces meaningful work in some domain at the level of an adult expert. The term is also applied more broadly to describe young people who are extraordinarily talented in some field.
The term wunderkind is sometimes used as a synonym for child prodigy, particularly in media accounts. Wunderkind also is used to recognise those who achieve success and acclaim early in their adult careers. From Wikipedia
