Dewar's Double Double 32 Year is a blended scotch crafted by master blender Stephanie Macleod which is aged in a "four-stage ageing process." The first step involves single malts and single grains which have been aged separately at least 32 years. Next, the single malts are blended together and rested in exhausted casks. This process is also done for single grains. Then, the blended single malts and blended single grains are blended together and again rested in exhausted casks. Finally, the blended scotch finishes its maturation in sherry casks. For the 32 years, it is finished in ex-Pedro Ximenez sherry.