I wonder if anyone has ever written a book on such a topic. I don't know if it would be useful, but I will just bet that it would fly off the shelves simply because it's so unusual.
But until that time, we are going to have to do the work ourselves. So today, this is what I want you to describe... Yes, today I want you to describe what an old man's beard would smell like! Who knows... it just might come in handy somewhere down the road when you are creating such a character lol.