How Many The Breaking of Boys and the Making of Men in 'The Cowboys' (1972) Cast Members Are Still Alive?

The Breaking of Boys and the Making of Men in 'The Cowboys' (1972) featured a cast of 3 tracked actors. Of these, 1 (33%) are still alive today and 2 have passed away. The oldest surviving cast member is Clay O'Brien, age 65. This film starred Mark Rydell and Clay O'Brien.