In MLB, of players on the 25 man active roster for at least half of the 2008 season, the youngest was 20 year old pitcher Clayton Kershaw of the Los Angeles Dodgers (born March 19, 1988) and the oldest was 45 year old pitcher Jamie Moyer of the Philadelphia Phillies (born November 18, 1962).
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The oldest player for NFL currently is: Saints PK John Carney who was born April 20, 1964.
The youngest player for NFL currently is: Titans WR Kenny Britt who was born Sept. 19, 1988.