Related: Paternal age and fitness in pre-industrial Finland (SMBE 2013)
"If you add together all the mental diseases ... your chance of having a child with something bad is about 5 percent," Watson explained [. . .] So here's Watson's prescription: "You could reduce the frequency of this 5 percent — maybe down to one and a half percent, or 1 percent — if everyone had their children or if the DNA came from them when they were 15," he said.