Scotch whisky whisky used. An age statement on the bottle, in the form of a number, must reflect the age of the youngest whisky used to produce that product. A whisky with an age statement is known as guaranteed age whisky. Scotch whisky without an age statement may, by law, be as young as three years old. In the early 21st century, such "No age statement" whiskies became more common, as distilleries responded to the depletion of aged stocks caused by improved sales. Labels may also carry various declarations of filtration techniques or final maturation processes. A Scotch whisky labelled as "natural"
Scotch whisky or "non-chill-filtered" has not been through a filtration process during bottling that removes compounds that some consumers see as desirable. Whisky is aged in various types of casks—and often in used sherry or port casks—during distinct portions of the maturation process, and will take on characteristics, flavour and aromas from such casks. Special casks are sometimes used at the end of the maturation process, and such whiskies may be labelled as "wood finished", "sherry/port finished", and so on. There are two basic types of Scotch whisky, from which all blends are made: Excluded from the definition of "single grain Scotch