New York: Doubleday, 1990. Limited Fortieth Anniversary Edition #1083 of 1500 copies. SIGNED by Asimov on the limitation page. 8vo. 223 pp. Tan cloth in color illustrated dustjacket. A fine copy in fine dustjacket; lacking the slipcase. Item #19435
Originally written in the summer of 1947 under the title "Grow Old with Me" for Startling Stories; Asimov greatly expanded the storyline and published it in January 1950 as Pebble in the Sky.