I always looked to about thirty as the barrier of any real or fierce delight in the passions, and determined to work them out in the younger ore and better veins of the mine—and I flatter myself (perhaps) that I have pretty well done so—and now the dross is coming.
George Gordon Noel Byron (1788–1824), British poet. Letter, January 18, 1823. Byron's Letters and Journals, vol. 10, ed. Leslie A. Marchand (1973-1981).
Byron had earlier expressed the same sentiment to poet Thomas Moore, to whom he wrote (February 2, 1818): "I will work the mine of my youth to the last vein of the ore, and then—good night. I have lived, and am content."