DENVER (AP) — Colorado's mountains aren't the only places showing more white on top. Residents of the resort towns below are graying at some of the fastest rates in the country.

Steamboat Springs, Edwards and Breckenridge ranked first, third and fourth, respectively, for the biggest gains in their senior populations this decade, while Glenwood Springs came in 13th, according to an analysis published in Newgeography.

"You have to recognize that not everybody wants to move to Florida. A lot of people enjoy those mountain communities," said Wendell Cox, a principal with Demographia near St. Louis...