Amobi Okoye was the youngest player in the NFL at the time that he was drafted.
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the youngest NFL player ever is Houston Texans DT Amobe Okoye
The 17-year old Feller became the youngest player ever to play a regular season game.
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Mohammad Ashraful
The youngest player ever to appear is: 18yrs 115days: Enzo Scifo (Belgium 2-0 Yugoslavia, 1984)
Bep Guidolin was the youngest player ever. He was 16 when he made his debut for Boston in 1942-43
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The youngest baseball player ever
Raul Paueve'