It is short sighted to just look at happiness from a day to day perspectve. Sure, somebody who spends there weekend carry for a child might feel less happy then somebody who is carefree that weekend. But who is happier in the long run? The real question is how satisfied seniors who either did or did not have children are with their lives overall. I don't know the answer, but my hunch is that the ones with children are at least as satisfied as those without them.