Developing an “easy way to measure biological age will have a wide array of applications in prediction and prevention of age-related diseases, drug discovery and forensics,” said Dr. Kang Zhang, founding director of the Institute for Genomic Medicine at the University of California, San Diego.
http://www.nytimes.com/2013/07/23/health/meaningful-markers-of-aging.html?pagewanted=all&_r=1&