DES MOINES, Iowa —

Millennials make up the largest population in Iowa, but an unsuspecting portion of the population is becoming the fastest-growing.

Iowa ranks among the top 10 states in the country with the most centenarians. Centenarians are people over the age of 100. The most recent 2020 U.S. Census counted 1,032 centenarians living throughout the state. In 2010, there were only 846.

Dr. Peter Martin is a longevity researcher at Iowa State University. His decades-long research of centenarians is looking for the answer to one of life's most pressing questions: What is the secret to living a long life?

"We keep saying centenarians are unique, right? If they are unique, how can they all be the same? How can there be one secret? You have to find out what your secret is, not the secre

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