Freddy Adu is 16
The youngest ever player in the English Football League is Reuben Noble-Lazarus who was 15 years and 45 days old when he came on as a substitute for Barnsley against Ipswich Town, September 30th 2008.
The youngest f.I.f.A player is 22 year old Lionel Messi.
The youngest hockey player in history was a little girl that was 2 years old
10 years old
Jack Wilshire from Arsenal is 19 years old and the youngest player in the Barclays Premier League.
7 1/2
16 years old
I believe the youngest ever player to enter the NBA was Andrew Bynum of the Lakers. He was 17 years old when he made it.
Joe Nuxhall was the youngest player in modern Major League history. He was 15 years old when he first pitched for the Reds.
Jack Rodwell- 17 yrs old (Everton) Theo Walcott-19 yrs old (Arsenal) Daniel Sturridge- 19 yrs old (Manchester City)
The 17-year old Feller became the youngest player ever to play a regular season game.
Andrew Bynum at 20 years old.