Cognac Courvoisier XO. Courvoisier XO is a selection of Master Blender from beautifully aged eaux de vie, between eleven and twenty-five years old, in order to reach the peak of the complexity and richness of cognac perfumes. The final product is fragrant and delicious insects, with a velvety texture and aromatic bouquet with notes of crème brulee, caramelized orange peel, and iris flower.