Since 2018, the XO "eXtra Old" Cognac, contains a blend of eaux-de-vie, the youngest of which must be at least 10 years old - up from 6 years. Cognacs in this category can also be labelled "Hors d'âge", "Extra", "Ancestral", "Ancêtre", "Or", "Gold", "Impérial", "Extra Old", "XXO" and "Extra Extra Old". The most prestigious ones can have aged for several decades.
The mentions "XXO" and "Extra Extra Old" are specific mentions whose eaux-de-vie are aged for 14 years or more.