Usage: 2 forms in 35 verses

Liddell-Scott-Jones

εἰκοσαετής (eikosaetēs) of twenty years G:A-NUI

εἰκοσαετής-ετής, ές,

or εἰκοσαετής-έτης, ες, of twenty years, παῖς [Refs 5th c.BC+]:—better εἰκοσιετής, feminine -ετίς, [Refs 5th c.BC+]