agerasia
/ˌadʒəˈreɪzɪə/rare
noun
The quality of not growing old; the non-appearance of the signs of age.
- Originally and chiefly in dictionaries..
Origin
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.