According to the Pro Football Hall Of Fame web site, the following played in the 2009 season:
John Carney, dob 20 Apr 1964 (New Orleans Saints)
Jeff Feagles, dob 7 Mar 1966 (New York Giants)
Matt Stover, dob 27 Jan 1968 (Indianapolis Colts)
Matt Turk, dob 16 Jun 1968 (Houston Texans)
Brett Favre, dob 10 Oct 1969 (Minnesota Vikings)
John Kasay, dob 27 Oct 1969 (Carolina Panthers)
Junior Seau, dob 19 Jan 1969 (New England Patriots)
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A player can be a free agent at anytime in the NFL. When a players contract is up and the team he plays for does not sign him, he will become a free agent.
To be allowed to declare eligibility for the NFL draft, players are required to complete high school and three years of college. The youngest person to enter the NFL is Amobi Okoye, a defensive tackle for the Texans. He was the tenth pick overall for the 2007 draft, being only 19 years old. He came from Nigeria to the United States and tested into the 9th grade at age 12.
The "average age" of the AFL players listed in the 'firsts' teams would be somewhere between 22 and 28 years of age.
While there is no specific age in which NBA players are told to retire, the average age in which they do retire is 36. Some players retire earlier due to injury, boredom, etc., while others retire later.
Tony Conigliaro of the Red Sox with 24, all coming in 1964 at the age of 19.