Studies show that married people live longer, perhaps because spouses insist on doctor's visits and keep your spirits up. Opal Prater, 100, last year celebrated her 75th wedding anniversary. She's still living life to the fullest, and loves to play Wii with her friends. According to a study by Evercare, close friendships are just as important as romantic relationships. It found that 82% of centenarians talk to friends and family every day, and 79% believe an active social life is good for your health. More From Forbes: America’s Healthiest Cities World’s Most Dangerous Places to Breathe The ‘Healthy’ Choices That Are Costing You The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.