On average, children laugh 400 times a day, while adults laugh about 15 times. (Palmer, Gary K. Brigham Young University. The Power of Laughter. p 32-35. Ensign, Sept 2007.)

The minimum number of laughs needed per day by adults is 30. Change this to at least 100 and recognize that the sky is the limit. (Beck, Martha, PhD. The Joy Diet. p 160-162. NY: Crown Publishers, 2003.)

By the time a child reaches nursery school, he or she will laugh about 300 times a day. Adults laugh an average of 17 times a day. (Science of Laughter. Discovery Health.)

Children laugh more frequently each day than adults. Some reports indicate that children laugh an average of 300 times per day, while adults get in less than 20. (Sprague-Smith, Marilyn, M.Ed. C’mon, Let’s Laugh. The North Carolina Journal for Women.)

Kids laugh 400 times a day while adults only laugh about 15 times a day. Research by Barb Fisher, University of Minnesota: 20 seconds of a good, hard belly laugh is worth three minutes on the rowing machine. (Brown, Tata Nicole, managing editor. Holistic Times, p 27. 15, No 4 (Clayton College of Natural Health, Alabama.)

Babies start to laugh at about age 10 weeks. At 16 weeks babies laugh about once per hour. Children age 4 tend to laugh about 15 times per hour. The average adult American laughs about 15 times a day. Very happy people laugh several hundred times per day. (Sobel, David S., and Robert Ornstein, MD. The Healthy Mind, Healthy Body Handbook. p 49-59. NY: Patient Education Media, Inc., 1996.)

William Fry, M.D., professor of psychiatry at Stanford University Medical School: the average kindergarten student laughs 300 times a day, the average adult laughs just 17 times a day. (Gallozzi, Chuck. Benefits of Laughter.)

Michael Miller, MD, director of preventive cardiology at the University of Maryland School of Medicine in Baltimore, recommends 15 minutes of laughter on a daily basis. (Laughter Facts.)

Reports estimate between 100-400 laughs per day in people who are in good spirits. (Hafen, Brent Q., et al. Mind/Body Health. p 550-560. MA: Simon & Schuster, 1996.)

Laughter occurs much more often when people are engaged in social interactions with others than when they are alone. (Martin, Rod A. White Papers. Do Children Laugh Much More Often than Adults Do? )