60-year-old Paul Risso makes his professional baseball debut 40 years after being drafted by the Pittsburgh Pirates. A shoulder injury had ended his college career shortly after being drafted. Today, Risso tosses one shutout inning for the Raton Osos of the minor independent Pecos League, giving up one hit to the Santa Fe Fuego. He is not the oldest pitcher to appear in a minor league game: Hub Kittle (63 years old for Springfield in 1980) and Ramón Arano (62 years old for Veracruz in 2001) are among those older.

On July 17, 2013 60-year-old Paul Risso makes his professional baseball debut 40 years after being drafted by the Pittsburgh Pirates. A shoulder injury had ended his college career shortly after being drafted. Today, Risso tosses one shutout inning for the Raton Osos of the minor independent Pecos League, giving up one hit to the Santa Fe Fuego. He is not the oldest pitcher to appear in a minor league game: Hub Kittle (63 years old for Springfield in 1980) and Ramón Arano (62 years old for Veracruz in 2001) are among those older.

Source
Baseball Reference July 17