The Younger You Look, the Longer You'll Live

http://www.drweil.com/drw/u/WBL02174/Womens-Heart-Attacks-Just-Like-Mens.html#2

"The only biological explanation ... was that the individuals who looked younger also tended to have longer telomeres (repeating DNA sequences at the ends of chromosomes) that are linked to aging." Telomeres are the main research subject for the 2009 Nobel Medical Science medalists.

The Dec 14 2009 article in BMJ is at
http://www.bmj.com/cgi/content/full/339/dec11_2/b5262
which concludes "Perceived age—which is widely used by clinicians as a general indication of a patient’s health—is a robust biomarker of ageing that predicts survival among those aged ≥70 and correlates with important functional and molecular ageing phenotypes."