The ideal gift! Buy the best bourbon online. Price and reviews available for Jefferson’s Reserve Very Old Bourbon Whiskey – 750ml Bottle. In 1997, when Jeffersons was first starting out, we found a 15-year-old bourbon that we immediately knew was rich, complex and needed to be brought to market. It was in 2003 that we decided to bring in other bourbons to marry with the original Jeffersons Reserve. Similar to Jeffersons, we still use over 50% of that mash bill and add up to 3 more bourbons to create more flavor and complexities. Jeffersons Reserve is a big, sophisticated bourbon that has a lot of flavor up front, a lot of weight mid palate and a deep, wonderful finish.