Originally published, New York: Gnome Press, 1958; London: Gollancz, 1963.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Methuselah's children by Robert A. Heinlein. ISBN 0450009149. Published by New English Library in 1971. Publication and catalogue information, links to buy online and reader comments.
