There are 64 players on FM14 with a rating of -9 (Meaning they have all the potential of becoming a wonderkid)
They are all under the age of 19 at the start of the game, some turn 19 almost right away but are still listed here.Download FM14 Wonderkid Shortlist
Download the shortlist
and put in Documents\Sports Interactive\Football Manager 2014\shortlists
In the game, you can import the list and look at the players.