Peter Hamilton's Commonwealth Saga has a pretty good treatment of the subject. His society has rejuvenation treatments that take care of aging bodies as well as

Peter Hamilton's Commonwealth Saga has a pretty good treatment of the subject. His society has rejuvenation treatments that take care of aging bodies as well as artificial memory/personality backups. You age, you go through a rejuve, you die of unnatural causes, your insurance grows you a clone body and dumps your memories in from backup. Pretty interesting consequences. They also have wormhole technology and a budding star empire, so population expansion is not really an issue.