Still, this is not a nationwide trend. Six states watched their median ages fall, with North Dakota leading the pack. Median age in the Peace Garden State fell by half a year, from 36.6 to 36.1. Meanwhile, Utah currently has the youngest population, with a median age of 30. Maine, meanwhile, is at the upper end of the spectrum, with a median age of 43.5.
North Dakota is an outlier.
Not only is it getting younger, it's also majority male – a distinction that only nine other states share – and saw the fastest-growing Hispanic population from 2011 to 2012, with a population change of over 15.5 percent.
Like the state's remarkably low unemployment rate (3.3 percent, as of April), these trend-bucking numbers are in part due to the oil and gas boom in the western part of the state, which has sent new workers flocking to North Dakota.
"I cannot drive across the city of Bismarck without hearing at least two radio ads on the radio for open jobs. I can't drive down the road without seeing signs saying, 'Now hiring, all positions,'" says Kevin Iverson, manager of the state Census office. "That's just the environment we're in."
While that boom has also brought in some Hispanic workers, Iverson also points out that it's easy for a small Hispanic population to post fast percentage growth. While that population added 15 percent over the course of a year, that added up to only 17,230 Hispanics statewide in 2012.