εἰκοσιετής
From LSJ
ἀκμὴ οὐδὲ ἔχει γενέσεως ὑπόστασιν καθ' ἑαυτήν → the culmination has no power of originating by itself
English (LSJ)
ές,
A v. εἰκοσαετής.
German (Pape)
[Seite 727] ές, zwanzigjährig, D. Cass. 55, 9.
Greek (Liddell-Scott)
εἰκοσιετής: -ές, ἴδε εἰκοσαετής.