The adage "like a kid at heart" may be truer than we think, since new research is showing that grown-ups are more immature than ever.
Specifically, it seems a growing number of people are retaining the behaviors and attitudes associated with youth.
As a consequence, many older people simply never achieve mental adulthood, according to a leading expert on evolutionary psychiatry.
http://dsc.discovery.com/news/2006/0...0606231100 30