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“In another surprising study published in 2010 in the journal Psychological Science, researchers Ernest Abel and Michael Kruger of Wayne State University examined vintage photos of 230 major league baseball players from the 1952 season, comparing the lifespans of the 184 players who had already died. Of the playersâ€� photos in the baseball cards, 40% showed no smile, 42% showed a partial smile,
and 18% had a full smile. Those players who had no smiles lived an average of 72.9 years, while those
with partial smiles had a lifespan of 75 years. However, those with big authentic grins lived to be 79.9 years on average, approximately 10% longer than those who did not smile in their photographs.

The researchers could not confirm whether any of the players were prompted by the photographer to smile for their photos or if they smiled spontaneously. At the same time, the data seems to suggest that distributed images of smiling people result in a longer, happier life. So smile in your photos!”
― Cary G. Weldy, The Power of Tattoos: Twelve Hidden Energy Secrets of Body Art Every Tattoo Enthusiast Should Know