Decadent Drinks Old Mull is a 20-year-old single malt Scotch whisky bottled at 53.1% ABV. The name suggests an island style associated with Mull, while the refill hogshead maturation points to a cask intended to let the distillery character stay relatively visible rather than adding heavy oak influence.
For a novice drinker, this means you can expect a mature whisky that may show more depth and subtlety than a younger bottle, with the higher strength likely giving it extra intensity. A few drops of water may help open it up and make it easier to explore.