Quiet Man 8 Year Old Single Malt Irish Whiskey is distilled through traditional Irish pot stills and aged for eight years in oak barrels before being re casked in first-fill bourbon barrels. “The difference between a good whiskey and a great whiskey lies not just in picking the best ingredients and having the most skilled distiller,” Mulgrew adds. “It lies in selecting the finest barrels to let the whiskey mature in.