Marcello Mastroianni. Marcello Mastroianni was 51 in Down the Ancient Stairs as 'Professor Bonaccorsi'.
Barbara Bouchet. Barbara Bouchet was 32 in Down the Ancient Stairs as 'Carla'.
Françoise Fabian. Françoise Fabian was 42 in Down the Ancient Stairs as 'Anna Bersani'.
Silvano Tranquilli. Silvano Tranquilli was 50 in Down the Ancient Stairs as 'professor Rospigliosi'.
Marthe Keller. Marthe Keller was 30 in Down the Ancient Stairs as 'Bianca'.
Lucia Bosè. Lucia Bosè was 44 in Down the Ancient Stairs as 'Francesca'.
Pierre Blaise. Pierre Blaise would have been no older than 20 in Down the Ancient Stairs as 'Tonio'.
Maria Michi. Maria Michi was 54 in Down the Ancient Stairs as 'la pazza aggressiva'.
Charles Fawcett. Charles Fawcett was 59 in Down the Ancient Stairs as 'dottor Sfameni'.
Enzo Robutti. Enzo Robutti was 41 in Down the Ancient Stairs as 'il pazzo scrittore'.
Ferruccio De Ceresa. Ferruccio De Ceresa was 53 in Down the Ancient Stairs as 'gerarca fascista in treno'.
Maria Teresa Albani. Maria Teresa Albani was >> in Down the Ancient Stairs 
Annunziata Fuciarelli. Annunziata Fuciarelli was >> in Down the Ancient Stairs as 'Asylum Patient (uncredited)'.
Mauro Bolognini. Mauro Bolognini was 53 in Down the Ancient Stairs as 'Director'
Ennio Guarnieri. Ennio Guarnieri was 45 in Down the Ancient Stairs as 'Director of Photography'
Tullio Pinelli. Tullio Pinelli was 67 in Down the Ancient Stairs as 'Screenplay'
Fulvio Lucisano. Fulvio Lucisano was 47 in Down the Ancient Stairs as 'Producer'
Ennio Morricone. Ennio Morricone was 46 in Down the Ancient Stairs as 'Original Music Composer'
Piero Tosi. Piero Tosi was 48 in Down the Ancient Stairs as 'Costume Design'
Mario Tobino. Mario Tobino was 65 in Down the Ancient Stairs as 'Novel'
Adriana Asti
Paolo Pacino
Paola Corazzi
Alessandra Cardini