A 21-year-old Glenrothes single malt is a complex whisky, with tasting notes that vary depending on the specific cask, but generally include rich, sweet, and spicy notes. Common aromas are vanilla, ripe fruit, and a hint of spice, while the palate often presents flavors of butter, caramel, chocolate, and dried fruit. The finish is typically long and warming, with notes of oak, spice, and fruit.