Sylvester McCoy. Sylvester McCoy was 81 in Doctor Who: The Eight Doctors as 'The Doctor'.
William Russell. William Russell would have been no older than 99 in Doctor Who: The Eight Doctors as 'Ian Chesterton'.
Frazer Hines. Frazer Hines was 80 in Doctor Who: The Eight Doctors as 'Jamie McCrimmon'.
Dinah Sheridan. Dinah Sheridan would have been no older than 92 in Doctor Who: The Eight Doctors 
Katy Manning. Katy Manning was 75 in Doctor Who: The Eight Doctors as 'Jo Grant'.
Lalla Ward. Lalla Ward was 73 in Doctor Who: The Eight Doctors as 'Romana'.
Janet Fielding. Janet Fielding was 71 in Doctor Who: The Eight Doctors as 'Tegan Jovanka'.
Richard Franklin. Richard Franklin would have been no older than 87 in Doctor Who: The Eight Doctors 
Waris Hussein. Waris Hussein was 86 in Doctor Who: The Eight Doctors as 'Director'
Ian Levine. Ian Levine was 71 in Doctor Who: The Eight Doctors as 'Director'
Terrance Dicks. Terrance Dicks would have been no older than 84 in Doctor Who: The Eight Doctors as 'Writer'
Mark Strickson