Final answer:
Cognac labeled as VSOP (Very Superior Old Pale) or Réserve is aged for a minimum of 4 years. The cognac aging classification includes VS (2 years), VSOP (4 years), and XO (10 years), with increasing aging leading to more complex flavors.
Step-by-step explanation:
The variety of cognac that is aged for a minimum of 4 years is designated as VSOP (Very Superior Old Pale) or Réserve. Cognac is classified based on its aging process in oak barrels. The aging classification system includes VS (Very Special), which is aged for at least 2 years; VSOP, which is aged for at least 4 years; and XO (Extra Old), which must have been aged for at least 10 years.
The longer the cognac ages, the more complex its flavor profile becomes. Therefore, if you see a bottle of cognac labeled as VSOP or Réserve, you can be assured that it has been matured for at least 4 years, providing a more matured and possibly more nuanced flavor compared to younger cognacs.