quincentenarian means one who or that which is between 500 and 599 years old. Lexicurio rates it Sui generis — a strength score of 88 out of 100.
quincentenarian is pronounced /ˌkwɪn.sɛn.təˈnɛəɹi.ən/.
noun
- One who or that which is between 500 and 599 years old.“As the Impératrice stopped two or three days in the magnificent harbor of Smyrna I had good opportunity to land and make my way to the scene of Polycarp’s Martyrdom amid the colossal cypresses which outdo all those of Italy, except the quincentenarians in the Giusti garden in Verona.”