It's increasingly possible to live well past our 90s, if current trends hold. In fact, the population of people in the U.S. who are 100 years or older (aka centenarians) grew nearly 44 percent from 2000 to 2014, according to the Centers for Disease Control and Prevention. But how are so many people making it to these very old ages? In addition to access to improved medicine, vaccines and antibiotics, they've got habits that lead to good health.
For example, they have friends. Research found that people with strong social relationships increase their odds for survival over a certain time by 50 percent.