Well, researchers at the University of Pittsburgh School of Medicine say mice are helping them better understand how to enhance health and delay aging. By studying mice that were bred to age rapidly, researchers discovered that injecting them with youthful stem cells taken from younger animals made the older mice live two to three times longer. This incredible finding means it might be possible to stall the biological declines of aging by delivering a shot of youthful vigor.
 

Read more: http://www.eurekalert.org/pub_releases/2012-01/uops-pas122911.php