One Colorado football league caught the eye of LIFE photographer Alfred Eisenstaedt, for a profile seen in its Oct. 9, 1939, issue.
Jim Petersen, 8, plays football in the Young America League for kids.
Alex Lindsay Jr., 10, member of the Young America League, who plays football for the Wolf Pack Club.
Bill Gregory, 8-year-old star tackle for the Wolf Pack football team in the Young America League for kids. See more great photos at Life.com.
In Denver in 1939, the daydreams of some 550 youngsters, 8 to 18 years old, came true. Those schoolboys joined the Young America League, which handed them brightly colored uniforms and taught them to play regular, 11-man football. Read more and see all the photographs at Life.com.