This is a list of the handful of 15, 16, and 17 year olds that made at least one first team appearance in the major leagues of Europe and MLS last season (08/09). The age listed is the players age when they made their first appearance of the season.
English Premier League (8)
16 - Jose Baxter (Everton), Jack Wilshere (Arsenal)
17 - Chris Wood (West Brom), Jack Rodwell (Everton), Federico Macheda (Manchester United), Aaron Ramsey (Arsenal), Aaron Doran (Blackburn Rovers), Danny Welbeck (Manchester United)
France Ligue 1 (5)
17 - Timothee Kilodziejczak (Lyon), Rajiv Van La Parra (Caen), Eden Hazard (Lille), Henri Saivet (Bordeaux), Yannis Taffer (Lyon)
German Bundesliga (5)
17 - Lennart Hartmann (Hertha BSC), Kevin Vogt (VfL Bochum), Juvhel Tsoumou (Eintracht Frankfurt), Marco Terrazino (TSG Hoffenheim), Pascal Gross (TSG Hoffenheim)
Italy Serie A (4)
17 - Daniele Ragatzu (Cagliari), Allesandro Crescenzi (Roma), Luigi Sepe (Napoli), Simone Zaza (Atalanta)
Scottish Premier League (3)
17 - John Fleck (Rangers), Paul Slane (Motherwell), James McCarthy (Hamilton Accies)
Spain La Liga (0)
Bojan Krkic was 18 years 3 days when he made his first 08/09 appearance for Barcelona.
Jozy Altidore was 18 years 313 days on his Villarreal Debut
17 - Abdus Fuad Ibrahim (Toronto FC)
16 - Abdus Fuad Ibrahim (Toronto FC)
17 - Israel Sesay (Los Angeles Galaxy)
15 - Reuben Noble-Lazarus* (Barnsley)
16 - Connor Wickham (Ipswich Town), Jonjo Shelvey (Charlton Athletic)
17 - Nathaniel Clyne (Crystal Palace), Kieron Djilali (Crystal Palace), Victor Moses (Crystal Palace), James Comley (Crystal Palace), Sean Scannell (Crystal Palace)
* At 15 years and 45 days old, Reuben Noble-Lazarus became the youngest player ever to feature in an English Football League match when he came on as a substitute during Barnsley's 3–0 Championship defeat by Ipswich Town on 30 September 2008.