Green grew up in West Milton, Ohio, located 15 miles (24 km) northwest of Dayton.
[6] For the second consecutive year, he was selected by the AP as the first-team quarterback on the All-OAC team.
[6] As a senior, he led the 1964 Wittenberg Tigers to its third consecutive OAC championship with a perfect 8–0 record.
[10] Sports Illustrated ran a feature story on Wittenberg's football team in November 1964 and noted Green's popularity: "[M]ention the name of Charlie Green and you will be saluted by a peal of bells from every one of the town's 143 churches.
His most imposing credential is a right arm that can get rid of a football so rapidly and with such accuracy that one opposing coach insists he is being aimed by an IBM computer.
[3] Green also handled punting for Wittenberg and played for the school's baseball and basketball teams.
[15] He also played in 1965 for the Boston Sweepers, leading them to the North Atlantic semi-pro league championship.
[15] During the 1966 season, he served as the Raiders' third-string quarterback, behind Tom Flores and Cotton Davidson.
In late August 1967, the team placed Green on waivers and, when he was unclaimed, sent him to the San Jose Apaches of the Pacific Coast Division of the Continental Football League.
[21] In the mid-1980s, Green was living in Phoenix, Arizona, working as a funding specialist for Merchant Banking Services.
[24] Green, his coach Bill Edwards, and his top receiver Bob Cherry were among the first 12 people inducted into the Wittenberg University Athletics Hall of Honor when it was established in 1985.