quadricentenarian means one who or that which is between 400 and 499 years old. Lexicurio rates it Rare gem — a strength score of 82 out of 100.
Etymology
From quadri- + centenarian.
noun
- One who or that which is between 400 and 499 years old.“Two of these trees are pines and two are oaks; there can be no doubt that they are 400 years old because the mikado says they are, and he ought to know, for, as we understand, he planted them himself. But, whether they be quadricentenarians or not, Mrs. Potter intends to utilize them for all the advertising there is in them.”