Don't know where we draw the lines exactly. Cause when I come to think about wonderkids it's most likely young players that hasn't already gotten their "real" breakthrough, and are most likely to play for a U-team. But players like Hazard, Götze etc. are all real wonderkids aswell. Depends on how you count it, with that said here you have my eleven based with players that have already gotten their breakthrough.
GK: Thibaut Courtois (Belgium, Atletico Madrid/Chelsea)
RB: Rafael (Brazil, Manchester United)
LB: David Alaba (Austria, Bayern München)
CD: Raphael Varane (France, Real Madrid)
CD: Phil Jones (England, Manchester United)
CDM: Yann M'vila (France, Rennes)
CM: Toni Kroos (Germany, Bayern München)
CM: Mario Götze (Germany, Borussia Dortmund)
RW: Eden Hazard (Belgium, Chelsea)
LW: Isco (Spain, Málaga)
ST: Neymar (Brazil, Santos)