Whisky Bowmore 15 Year Old. A whisky coming into its prime. This 15 year old single malt, which spends its final three years in oloroso sherry casks, is elegantly balanced between this sherry influence and the distillery's fruit and peat characteristics including a siren like whisper of tropical fruit that will delight fans of older style Bowmore. Now is the time to try Bowmore 15 Year Old, which reflects the best of the distillery's output from around the new millennium.