by Robert A. Heinlein
Family groups live for hundreds of years thanks to the Howard Foundation.http://www.bbc.co.uk/iplayer/episode/b007rgl9/Robert_A_Heinleins_Methuselahs_Children_Episode_1/
What happens when a family of 100,000 can no longer hide their secret that they have lifespans often double that of normal people? They escape to another planet, of course. But what happens when they find a paradise planet where they don't have to labor and toil? Have a short, enjoyable read to find...