I'd definitely like some input from people more educated then I though, because I'm not completely sure if it would work like I imagine.
Eugenics is the practice of discouraging reproduction by persons having genetic defects or presumed to have inheritable undesirable traits or encouraging reproduction by persons presumed to have inheritable desirable traits, in order to improve the human gene pool. It's been deemed inhumane, probably rightly so.
My idea however would be much more simple, and humane. Imagine an age limit much higher than the current average were enforced at which two individuals could conceive a child. This would promote longer lives, because only those able to survive to this age would be able to pass their genes along. It would promote better genes, and wouldn't discriminate against any specific parties.