Bushmills 21 Year Old Whiskey is the pinnacle of Irish whiskey, Bushmills 21 year old single malt whiskey is aged in casks seasoned with sherry and bourbon, then married and transferred to Madeira casks for the final 2 years of maturation. It has enormous depth that intertwines flavors of dried fruits with a spicy, aromatic malt and subtle hints of raisin and nuts. This whiskey should always be served clean.