Have kids when you're young: Lately, I've emphasized the reasons why folks should get married and start families at younger ages. One fact that few are aware of is how a father puts his kids' health at risk by having them when he's older.
According to the Wikipedia page, there are 34 disorders that have been linked to older paternal age. "Generally, older men have a greater probability of fathering children with a genetic defect than younger men do. This is seen as likely due to genetic copying errors which may increase in number after repeated spermatogenesis cycles over a man's lifetime."
Better known is the risk of Down Syndrome when the mother is 35 or older. Genetics testing is offered to any pregnant woman 35 or older, due to potential increased risk of this disorder as well as others.
Having kids when you're younger is exactly the kind of eugenics approach I can get behind.