40, age, preventSelect GOT IT! to provide a response.The response we were seeking was something along the lines of "age at which a woman should have regular mammograms", however, upon publishing the clue, we realized that the word "prevent" was not quite correct. We should have used a word like "detect" instead. So, it wasn't a trick question, just a poor choice of words on our part. I'm sure all you nurses out there caught that one.