30 Is a Dangerous Age, Cynthia (also known as Thirty Is a Dangerous Age, Cynthia) is a 1968 British romantic comedy film directed by Joseph McGrath and starring Dudley Moore, Eddie Foy, Jr. and Suzy Kendall. It was written by Moore, McGrath and John Wells.

Plot

London jazz pianist and aspiring composer Rupert Street is soon to turn 30 and fears reaching that age without having accomplished anything. To avoid this, he sets himself goals to marry a woman and write a musical. He meets the gorgeous but taken Louise, a fellow boarder, and pursues her in his goofy and inept manner. A fight with competing suitor Paul leaves Rupert with his right arm in a cast and unable to play the piano.