Parmigiano-Reggianos are more often aged 2 years.
Those labeled stravecchio have been aged 3 years, while stravecchiones are 4 years old.
Their complex flavor and extremely granular texture are a result of the long aging.
The words Parmigiano-Reggiano stenciled on the rind mean that the cheese was produced in
the areas of Bologna, Mantua, Modena or Parma (from which the name of this cheese originated).