> What's another way of describing someone who is a nonagenarian?And the answer: they're in their 90s.Photo Courtesy: MAX MUMBY/INDIGO.The odds of living to the age of 90 hasincreased markedly in the past century. In fact, the number of nonagenarians inthe US and UK has more than doubled since 1994. Looking ahead, the number ofpeople who reach age 100, or centenarians, will increase eightfold worldwide bythe year 2050.The growing number of individuals over the age of 90 is indicative ofadvancements of public health and improved living conditions over the course ofthe century. Interestingly, the nonagenarians of today have lived throughever-changing perceptions of how and which forms of medicine work: most spenttheir lives believing cigarettes weren't bad for your lungs, feared polio at onepoint or another, or lacked a vaccine for a disease that hardly even existstoday. As public health is a constantly growing field, we can expect this trend tocontinue on its upward trajectory. According to Pew Research Center, China willbe the leader in centenarians by 2050, followed by Italy and Japan. The UK andUS are predicted to age a bit slower, with a predicted 9.7 centenarians per10,000 people in the U.S. by 2050. For more stats on our aging populations, check out this[https://www.pewresearch.org/fact-tank/2016/04/21/worlds-centenarian-population-projected-to-grow-eightfold-by-2050/] Pew Research Center article.