While we regularly sample all of our Michter's barrels to see how our whiskey is aging, we pay even extra special attention to our barrels once they are over 17 years old. At Michter's we consider 17 to 20 years the "Fork in the road point", when certain barrels of whiskey can achieve an extraordinary level of quality. It is these particular barrels that our Master Distiller, Dan McKee, personally selects for our very limited bottling of Michter's 20 Year Kentucky Straight Bourbon.
What you smell and taste in a whisky is highly subjective.
Even the pros do not always agree on the tasting notes. Therefore, we have combined the tasting notes from several sources into a cross-section Nose, Palate, and Finish to find the commonalities between two whiskies. We use the Aroma Wheel with its concentric circles of increasingly specific tastes and smells (general in the center; more specific the further out you go) to find Exact, Secondary, and General matches between two whiskies. We also take into account other important factors like mash bill, barrel type(s), ABV, region, ratings, price and more. We then weight each factor based on what we believe to be the approximate importance it has in determining whether two whiskies are similar.
We're all different.
Again, we cannot stress enough that what you smell and taste in a whisky is likely going to be different than the person you're drinking it with. Whisky Mates is meant to be a guide to help you find what you like drinking, using the best methodologies available. In the end, rely on your own palate to tell you what you like and don't like.