Old ale
dark, malty English beer

Old ale is a form of strong ale. The term is commonly applied to dark, malty beers in England, generally above 5% ABV, and also to dark ales of any strength in Australia. It is sometimes associated with stock ale or, archaically, keeping ale, in which the beer is held at the brewery. In modern times, the line has blurred between old ale and barley wine.
History
Historically, old ales served as a complement to mild ales, and in pubs of the era typically the landlord would serve the customer a blend of the sharper stock ale with the fruitier, sweeter mild ale to the customer's taste. In London especially, the aged ale would take on a tart note from a secondary fermentation with Brettanomyces yeast which was present either in the pitching yeast or in the wooden equipment. Because of the time required for the aging process, some investors would buy mild ale from brewers, age it into old ale, and sell it at the higher price. Eventually, brewers began to keep some beer behind at the brewery, age it themselves and sell it to the pubs. In some cases old ale was a blend of young and old. The "stock ale" was the brewery's very aged ale and was used to inject an "old" quality, and perhaps acidity to the blend.
The public source identifies “Old ale” as dark, malty English beer. This brief keeps that definition visible, then builds a research path around dark, malty and English.
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This entry incorporates text from “Old ale” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.