Smiling can extend your life。A Wayne State University study measured smiles in headshots of baseball players from the 1952 season and found that those with the broadest smiles lived to an average of 79.Nine years old, two years longer than the average American。Those who didn't smile at all during the photo shoot lived an average of 72 years.9 years old;Seven years less than those with big smiles。In addition, the Kraft and Pressman study cited above shows that smiling improves heart health because it slows down the heart rate during stress。Add a smile to a healthy regime of eating well, sleeping well and exercising, and you may be able to live for many more years。