Oporto Wines indicating old age - 10,20,30 or 40 years - are superior REMARKS within the category Old Tawni. Each of these qualities are derived from a careful selection of wines of different ages and are aged in oak barrels. they bring vitality and freshness, while the oldest are the necessary complexity. The secret of this creative art belongs to the maestro grocer, who, only after many years of practice, get wines unique character and that are consistent year after year.