What you have here is a 'study', conducted by an institution of leftist leanings. It's good to review them critically, since such 'studies' take a few years to become accepted public policy, then becoming part of the legislative debate process, and eventually, a law. The Peoples Rebulic of China has a law restricting the reproductive rights of their own people, and there are advocates of that same policy here in the U.S. The embryonic stages of such a policy has it's underpinnings in these type of 'studies'. In other words, if the government can control you in a grater measure than they already do, they have to get your consent first. This study smacks of a worldview that is designed to manipulate people's thinking about marriage and childbearing. If those who funded the study can get you to see that 'childlessness equals long and fulfilled life', then maybe you'll accept this for yourself but more importantly, YOU'LL WANT OTHERS TO DO THE SAME, i.e., RESTRICT THE FREEDOMS OF OTHERS.