Ian Richardson. Ian Richardson was 49 in The Sign of Four as 'Sherlock Holmes'.
David Healy. David Healy was 54 in The Sign of Four as 'Dr. John Watson'.
Thorley Walters. Thorley Walters was 70 in The Sign of Four as 'Major John Sholto'.
Michael O'Hagan. Michael O'Hagan was 43 in The Sign of Four as 'Mordecai Smith'.
Cherie Lunghi. Cherie Lunghi was 31 in The Sign of Four as 'Mary Morstan'.
Joe Melia. Joe Melia was 48 in The Sign of Four as 'Jonathan Small'.
Terence Rigby. Terence Rigby was 46 in The Sign of Four as 'Inspector Layton'.
Clive Merrison. Clive Merrison was 38 in The Sign of Four as 'Bartholomew Sholto'.
Richard Heffer. Richard Heffer was 37 in The Sign of Four as 'Thaddeus Sholto'.
John Benfield. John Benfield was 32 in The Sign of Four as 'McMurdo'.
Gordon Rollings. Gordon Rollings was 57 in The Sign of Four as 'Mr. Sherman'.
John Pedrick. John Pedrick was >> in The Sign of Four as 'Tonga'.
Robert Russell. Robert Russell was 47 in The Sign of Four as 'Williams'.Merelina Kendall. Merelina Kendall was >> in The Sign of Four as 'Mrs. Smith'.
Desmond Davis. Desmond Davis was 57 in The Sign of Four as 'Director'Fred Carter. Fred Carter was 51 in The Sign of Four as 'Assistant Art Director'Dennis C. Lewiston. Dennis C. Lewiston was 49 in The Sign of Four as 'Director of Photography'Charles Edward Pogue. Charles Edward Pogue was >> in The Sign of Four as 'Screenplay'
Harry Rabinowitz. Harry Rabinowitz was 67 in The Sign of Four as 'Music'
Arthur Conan Doyle. Arthur Conan Doyle would have been no older than 71 in The Sign of Four as 'Novel'John Jay. John Jay was 63 in The Sign of Four as 'Still Photographer'Dudley Plummer. Dudley Plummer was >> in The Sign of Four as 'Sound Mixer'Marilyn Johnson. Marilyn Johnson was 39 in The Sign of Four as 'Casting'
Julie Harris. Julie Harris was 62 in The Sign of Four as 'Costume Design'Eddie Collins. Eddie Collins was >> in The Sign of Four as 'Camera Operator'