In the Heinlein (SF, eg. "Time enough for love", and related books) universe, long life is achieved by paying children of long lived parents too marry each othe

In the Heinlein (SF, eg. "Time enough for love", and related books) universe, long life is achieved by paying children of long lived parents too marry each other. Ultimately the program is so successful that they are persecuted by the rest of the earth of being so long lived that they have to flee the earth!