Methuselah's Children by Robert A Heinlein

Methuselah's Children is a 1941 science fiction novel by Robert A. Heinlein, originally serialized in Astounding Science Fiction (July, August, September 1941). It was expanded into a full-length novel in 1958. In 1997, Methuselah's Children won the Prometheus Hall of Fame Award for Best Classic Libertarian Sci-Fi novel. Heinlein used his "Future History" series of stories as a background for this novel about the long-lived Howard Families, star travel, and human freedom.