Titus 2:2

Be sober. The Greek Fathers, Theodoret, and Theophylactus, translate the word, sober, attentive, or vigilant. But Latin interpreters understand it of sobriety, in the literal meaning of the word. Old men oftentimes under pretense of weakness, drink wine to excess. The ancients called wine the milk of old men; hence aquilæ senectus has passed into a proverb, to designate an old man who drinks much and eats little. (Calmet)