One of the mysteries of the English language finally explained.
The quality of not growing old; the non-appearance of the signs of age.
Early 18th century; earliest use found in Phillips's New World of Words. From post-classical Latin agerasia from Hellenistic Greek ἀγηρασία eternal youth (Galen) from ancient Greek ἀ- + γῆρας old age + -ία.
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