κάλλιστον ἐφόδιον τῷ γήρᾳ ἡ παιδεία (Aristotle, quoted by Diogenes Laertius 5.21) → the finest provision for old age is education
Use Ar. and P. μέδιμνος, ὁ (Dem. 467) (equals about a bushel and a half).