Joel 1:2 - Albert Barnes' Notes on the Bible

Hear this, ye old men - By reason of their age they had known and heard much; they had heard from their fathers, and their father’s fathers, much which they had not known themselves. Among the people of the east, memories of past times were handed down from generation to generation, for periods, which to us would seem incredible. Israel was commanded, so to transmit the vivid memories of the miracles of God. The prophet appeals “to the old men, to hear,” and, (lest, anything should seem to have escaped them) to the whole people of the land, to give their whole attention to this thing, which he was about to tell them, and then, reviewing all the evils which each had ever heard to have been inflicted by God upon their forefathers, to say whether this thing had happened in their days or in the days of their fathers.