It was Pele at 17 years.
It is Michael Owen.
The 17-year old Feller became the youngest player ever to play a regular season game.
Andrew Bynum 17
Norman Whiteside is the youngest player to appear in a World Cup, when he debuted for Northern Ireland aged 17 years and 41 days at 1982 FIFA World Cup.
Bep Guidolin was the youngest player ever. He was 16 when he made his debut for Boston in 1942-43
It was Michael Owen.
It is sachin Tendulkar.