Prof Howard Friedman, a psychologist at the University of California, analysed their progress over 80 years and found that “early school entry was associated with less educational attainment, worse midlife adjustment and, most importantly, increased mortality risk”.
Friedman is interested in health analysis and has written a book called The Longeviety Project. The above is a quote from the linked newspaper article so it may or may not be what Friedman said. If it is, the findings are at odds with other studies showing that increased educational attainment in associated with decreased mortality risk. These include the Framingham Offspring study:
http://www.ncbi.nlm.nih.gov/pubmed/8475012http://www.rwjf.org/en/library/research/2012/12/why-does-education-matter-so-much-to-health-.htmlhttp://www.sciencedaily.com/releases/2008/03/080311081149.htmThe research on accelerated students suggests that they have increased educational attainment so hopefully longer life but this is all correlational.
The best way to sell a book is to tout the opposite of current thinking. Not to be cynical.
