Bliss: Mathematically Certain Loneliness

I am profoundly skeptical of the "research findings" referenced here for many reasons. Principally among them is whether or not the "studies" incorporated the views of elderly childless couples, people who have enjoyed decades of greater materialistic consumption and self-indulgent lifestyles (oops, sorry, inner-directedness), but for whom old age can only be marked by diminishing familial relations rather than a static to growing family circle and all that it entails. Life without children might seem great in your 40s, but how about in your 60s and beyond? Did anybody interview those folks?