Hennessy Extra Old Cognac 70cl Prepare to be taken on an epic journey exploring each and every one of your senses, with the Hennessy XO Extra Old Cognac. The origins of the age denotation ‘Extra Old’ in fact date back to the Hennessy maison, when Master Blender Maurice coined this English term in 1870 in accordance with its strong connection to foreign countries, such as the US and Great Britain.