Both Cognac and Whiskey is aged in casks. The age of brandies can be below three to six years, and Cognac at least 2 1/2 years. Most of the brandies are below six years, but can also be a hundred years old. While cognac and brandy uses age terms such as VOP, VS, VSOP or XO, Whiskey shows the exact age of its content: for example 3, 5, 10, 12 or 15 years.