One of the mysteries of the English language finally explained.
1Horse Racing Coursing
Originally Horse Racing (later also Coursing and in greyhound racing). Of a race: open to competitors of all ages. Also of the animals eligible to take part in a race: of all ages.
2Forestry. Designating a forest made up of a mixture of trees of all ages.
Mid 19th century; earliest use found in The New Sporting Magazine. From all + age + -ed.
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