[dleslie]

It's not a failure to launch so much as it is a reasonable choice to refuse a path that is not appealing to them. While I chose to marry and have children I in no way presume that my choice to do so is correct for all; it is entirely reasonable for others to choose differently than I.

Why should the individuals in question follow traditional paths, when there's ample adequate satisfaction and happiness to be found in life paths that carry less personal responsibility and financial burden? If having children and a life-partner does not out weigh the relevant stressors, in their subjective assessment, then I see no reason why they'd choose as I have.