Apparently, "grown-ups are more immature than ever". A rather extended formal education phase seems to be the culprit.
A “child-like flexibility of attitudes, behaviors and knowledge” is probably adaptive to the increased instability of the modern world, [Bruce Charlton] believes. Formal education now extends well past physical maturity, leaving students with minds that are, he said, “unfinished.”
“The psychological neoteny effect of formal education is an accidental by-product — the main role of education is to increase general, abstract intelligence and prepare for economic activity,” he explained. ...
"When formal education continues into the early twenties," he continued, "it probably, to an extent, counteracts the attainment of psychological maturity, which would otherwise occur at about this age.”
It made you go "Huh?", didn't it? The following paragraph in the same article made me go "Uh, oh!".
"People such as academics, teachers, scientists and many other professionals are often strikingly immature outside of their strictly specialist competence in the sense of being unpredictable, unbalanced in priorities, and tending to overreact,” [Charlton said].
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On an unrelated note, the internets are being blamed, partly, for "a drastic decline in the number of close friends that Americans have" [this link too is via Slashdot].
New technology links people over greater distances, but cuts into face-to-face meeting time, the researchers said.