A traditionally strong, dark ale.

In Britain, this term is sometimes used to indicate a medium-strong dark Ale that ages in the bottle. The beer develops considerably as it conditions in the bottle, some for twenty or so years. The slow work of the yeast in the bottle may increase the alcohol content by ten percent or more. These beers are most often consumed in winter. In Australia, any dark Ale may be identified as "Old".

In England it means a medium strong ale. In Australia it means dark ale.