In many tribal cultures children are considered self-sufficient at or near the age of six. For all practical purposes, this means if they were lost overnight in the wild they might not perish. Of course, in modern industrial societies, children tend to be protected much longer. But there’s evidence that the age six still resonates with men. Researchers say that many men have affairs around the time their oldest child turns six. Chances are their genes will still march on even without direct oversight.
