The Glenrothes 36 Year Old 1978 Single Cask #3631 - The Glenrothes 36 Year Old 1978 Single Cask #3631 has a unique character of ripe peaches, candied peel and sweet ginger. The Glenrothes is a Speyside single malt Scotch whisky. Quietly and without fanfare, The Glenrothes has been producing some of Speyside's finest single malt scotch whisky for more than a century.