David Suchet. David Suchet was 53 in The Murder of Roger Ackroyd as 'Hercule Poirot'.
Philip Jackson. Philip Jackson was 51 in The Murder of Roger Ackroyd as 'Chief Inspector Japp'.
Oliver Ford Davies. Oliver Ford Davies was 60 in The Murder of Roger Ackroyd as 'Dr. Sheppard'.
Malcolm Terris. Malcolm Terris was 58 in The Murder of Roger Ackroyd as 'Roger Ackroyd'.
Selina Cadell. Selina Cadell was 46 in The Murder of Roger Ackroyd as 'Caroline Sheppard'.
Daisy Beaumont. Daisy Beaumont was 26 in The Murder of Roger Ackroyd as 'Ursula Bourne'.
Flora Montgomery. Flora Montgomery was 25 in The Murder of Roger Ackroyd as 'Flora Ackroyd'.
Nigel Cooke. Nigel Cooke was 42 in The Murder of Roger Ackroyd as 'Geoffrey Raymond'.
Jamie Bamber. Jamie Bamber was 26 in The Murder of Roger Ackroyd as 'Ralph Paton'.
Roger Frost. Roger Frost was 51 in The Murder of Roger Ackroyd as 'Parker'.
Vivien Heilbron. Vivien Heilbron was 55 in The Murder of Roger Ackroyd as 'Mrs. Ackroyd'.
Gregor Truter. Gregor Truter was >> in The Murder of Roger Ackroyd as 'Inspector Davis'.
Andrew Grieve. Andrew Grieve was 60 in The Murder of Roger Ackroyd as 'Director'
Clive Exton. Clive Exton was >> in The Murder of Roger Ackroyd as 'Screenplay'
Agatha Christie. Agatha Christie would have been no older than 85 in The Murder of Roger Ackroyd as 'Novel'