It takes a lot of mental energy to come up with quick-witted quips that keep grins on others' faces. Those who have a good sense of humor tend to be more creative . And that's not the only cognitive benefit: One 2014 study found that laughter can also lead to a sharper short-term memory .

There's a line between well-intentioned humor and mean-spirited jokes, and those with good humor know the difference. "Most comedy is based on getting a laugh at somebody else's expense. And I find that that's just a form of bullying in a major way," comedian Ellen DeGeneres told CBS News in 2012 . "So I want to be an example that you can be funny and be kind, and make people laugh without hurting somebody else's feelings."

Overall, humor can benefit us physically and emotionally, according to Peter McGraw, Ph.D., an associate professor at University of Colorado Boulder who studies emotions. "When done well, humor can have a significant positive effect on your life.

By developing a better understanding of humor we believe we can then suggest ways that people can live better lives -- from helping them cope with pain and stress to encouraging people to use humor to criticize brands that have done them wrong."

While most people fret with each passing birthday, good-humored individuals take it all in stride. Those "over the hill" cards? The jokes about looking older? Child's play -- and that light-hearted attitude may help you live longer. Research suggests that a sense of humor increases longevity into retirement . Bring it on, birthdays.