George O'Brien. George O'Brien was 36 in O'Malley of the Mounted as 'Constable O'Malley aka Duke Kinnard'.
Irene Ware. Irene Ware was 25 in O'Malley of the Mounted as 'Edith 'Edie' Hyland'.
Stanley Fields. Stanley Fields was 52 in O'Malley of the Mounted as 'Red Jagger'.
James Bush. James Bush was 28 in O'Malley of the Mounted as 'Bud Hyland'.
Victor Potel. Victor Potel was 46 in O'Malley of the Mounted as 'Gabby - the Cook'.
Reginald Barlow. Reginald Barlow was 69 in O'Malley of the Mounted as 'Commissioner'.
Richard Cramer. Richard Cramer was 46 in O'Malley of the Mounted as 'Butch - Henchman'.
Tom London. Tom London was 46 in O'Malley of the Mounted as 'Lefty - Henchman'.
Crauford Kent. Crauford Kent was 54 in O'Malley of the Mounted as 'Inspector McGregor'.
Raoul Freeman. Raoul Freeman was 41 in O'Malley of the Mounted as 'Mountie (uncredited)'.David Howard. David Howard was 39 in O'Malley of the Mounted as 'Director'Frank B. Good. Frank B. Good was 51 in O'Malley of the Mounted as 'Director of Photography'Daniel Jarrett. Daniel Jarrett was >> in O'Malley of the Mounted as 'Writer'Frank Howard Clark. Frank Howard Clark was 47 in O'Malley of the Mounted as 'Writer'
William S. Hart. William S. Hart was 71 in O'Malley of the Mounted as 'Writer'Sol Lesser. Sol Lesser was 46 in O'Malley of the Mounted as 'Producer'Arthur Hilton. Arthur Hilton was 38 in O'Malley of the Mounted as 'Editor'Lewis J. Rachmil. Lewis J. Rachmil was 27 in O'Malley of the Mounted as 'Art Direction'