Louis sized up the gentleman speaking—a man of average height wearing a dark brown bowler hat and a flapping trench coat that had been buffeted by the wild wind and a rain-soaked beard.
Although the beard aged him, if it had been some time ago, Louis would have guessed him to be a mature gentleman around forty. However, his time in the Police Intelligence Department had taught him some useful skills in discerning people's age. After briefly observing the gentleman's smooth, youthful-looking skin around his temples and the youthful sparkle in his eyes, Louis quickly concluded that this gentleman was most likely under thirty.
With his conclusion formed, Louis grew more confident in initiating conversation and asked with a smile, "Let me guess, you know Mr. Babbage, and Mr. Babbage was once the Lucasian Professor of Mathematics at Cambridge University. So, are you his student, a distinguished graduate from Cambridge University?"