A 29-year old aspiring composer—still single and without any romantic prospects—vows to both marry and write a hit musical before he turns 30. Director Joseph McGrath's 1968 British comedy stars Dudley Moore, Suzy Kendall, Eddie Foy Jr. and Patricia Routledge.
Is 30 Is a Dangerous Age, Cynthia! on Netflix? Unfortunately the movie 30 Is a Dangerous Age, Cynthia! is not yet available on Netflix.
| Directing | Joseph McGrath | Director |
| Crew | Richard Williams | Title Graphics |
| Editing | Bill Blunden | Editor |
| Production | Walter Shenson | Producer |
| Sound | Dudley Moore | Original Music Composer |
| Writing | Joseph McGrath | Writer |
| Writing | Dudley Moore | Writer |
| Writing | John Wells | Writer |
| Camera | Billy Williams | Director of Photography |
