Methuselah's Children

Lazarus Long, member of a select group bred for generations to live far beyond normal human lifespans, helps his kind escape persecution after word leaks out and angry crowds accuse them of withholding the "secret" of longevity. Lazarus and his companions set out on an interstellar journey and face many trials and strange cultures, like a futuristic Odysseus and his crew, before returning to Earth.