Most regions across the country have seen the age of their population gradually climb as baby boomers begin to retire. But for some jurisdictions, the growth of this demographic group has been far more pronounced than others.

The Census Bureau released updated data this morning for all states and counties, showing pockets of the country are adding older residents fairly rapidly.

More than 43 million Americans now fall into the 65 and over age bracket, about a 7.1 percent increase from 2010. Over the same period, the nation’s total population also rose, but only by 1.7 percent.

A handful of states recorded steep increases up through last summer.

Nevada’s total population climbed 2.2 percent over the roughly two-year period ending in July 2012, while its 65 and older population jumped an estimated 11.3 percent. Colorado’s 65 and over population similarly rose 11.6 percent, compared to 3.1 percent for its total population.

Want more urban news? Click here.

For a few of the jurisdictions experiencing the sharpest growth for this age cohort, the change hasn’t gone unnoticed.

One of the fastest growing such counties, Brunswick County, N.C., added more than an estimated 4,000 residents 65 and older since 2010. Huey Marshall, the county’s public information officer, said the region bordering South Carolina along the coast is experiencing an influx of wealthy retirees.

“You would not know there was a recession here. We’re issuing building permits as if nothing happened,” he said.

A few local churches expanded to accommodate larger congregations. Marshall said some theaters moved up their show times to earlier in the day, which he suspects may also be related.

Some of the highest concentrations of older residents can be found in the New England states.

While New Hampshire’s total population has fluctuated little, the state’s 65 and older population swelled 8.7 percent since 2010, according to Census Bureau estimates. Its median age also increased from 41.1 to 42 years – the largest increase of any state.

The state is not growing as fast as in years past, while migration has stalled, said Joanne Cassulo, a senior planner at the New Hampshire Office of Energy and Planning’s State Data Center.

According to the new estimates, the oldest states (in terms of median age) are: Maine (43.5 years), Vermont (42.3 years), New Hampshire (42 years) and West Virginia (41.7 years)

The following table shows changes in states’ 65+ population and total counts, comparing estimates for July 2012 with 2010 Census base figures:

            State 65+ % Change Since 2010 Total % Change Since 2010 2012 Total Population 2012 65+ Population 2012 Median Age Alabama 6.3 0.9 4,822,023 699,380 38.2 Alaska 13.8 3.0 731,449 62,497 33.7 Arizona 10.2 2.5 6,553,255 971,533 36.5 Arkansas 5.4 1.1 2,949,131 442,590 37.6 California 8.3 2.1 38,041,430 4,600,085 35.5 Colorado 11.6 3.1 5,187,582 613,241 36.3 Connecticut 5.2 0.5 3,590,347 532,712 40.5 Delaware 8.7 2.1 917,092 140,474 39.2 District of Columbia 4.5 5.1 632,323 71,889 33.6 Florida 7.7 2.7 19,317,568 3,509,715 41.3 Georgia 10.4 2.4 9,919,945 1,139,699 35.7 Hawaii 8.0 2.4 1,392,313 210,801 38.3 Idaho 9.2 1.8 1,595,728 212,578 35.2 Illinois 5.3 0.3 12,875,255 1,694,437 37 Indiana 5.7 0.8 6,537,334 889,148 37.2 Iowa 3.8 0.9 3,074,186 470,305 38.1 Kansas 4.8 1.1 2,885,905 394,269 36 Kentucky 6.3 0.9 4,380,415 614,653 38.3 Louisiana 6.7 1.5 4,601,893 595,205 35.9 Maine 7.2 0.1 1,329,192 226,376 43.5 Maryland 7.8 1.9 5,884,563 763,019 38.1 Massachusetts 6.2 1.5 6,646,144 958,494 39.3 Michigan 6.0 0.0 9,883,360 1,442,714 39.4 Minnesota 6.8 1.4 5,379,139 729,767 37.6 Mississippi 6.2 0.6 2,984,926 404,075 36.3 Missouri 5.4 0.6 6,021,988 883,181 38.1 Montana 7.9 1.6 1,005,141 158,289 40.1 Nebraska 4.3 1.6 1,855,525 257,354 36.2 Nevada 11.3 2.2 2,758,931 360,914 36.9 New Hampshire 8.7 0.3 1,320,718 193,803 42 New Jersey 5.4 0.8 8,864,590 1,250,555 39.3 New Mexico 8.3 1.3 2,085,538 294,833 36.8 New York 5.3 1.0 19,570,261 2,757,572 38.1 North Carolina 9.2 2.3 9,752,073 1,347,869 37.8 North Dakota 3.3 4.0 699,628 100,666 36.1 Ohio 5.1 0.1 11,544,225 1,705,122 39.2 Oklahoma 5.4 1.7 3,814,820 534,247 36.2 Oregon 9.0 1.8 3,899,353 581,619 38.8 Pennsylvania 4.3 0.5 12,763,536 2,042,861 40.5 Rhode Island 4.4 -0.2 1,050,292 158,629 39.8 South Carolina 10.1 2.1 4,723,723 695,459 38.4 South Dakota 4.8 2.4 833,354 122,183 36.9 Tennessee 7.6 1.7 6,456,243 918,507 38.3 Texas 9.1 3.6 26,059,203 2,839,295 33.9 Utah 8.8 3.3 2,855,287 271,419 29.9 Vermont 8.1 0.0 626,011 98,444 42.3 Virginia 8.8 2.3 8,185,867 1,062,505 37.6 Washington 9.8 2.6 6,897,012 908,417 37.5 West Virginia 4.9 0.1 1,855,413 311,949 41.7 Wisconsin 6.1 0.7 5,726,398 824,500 38.9 Wyoming 7.7 2.3 576,412 75,508 36.9 As a whole, the nation’s median age stood at 37.4 years last July, up from 37.2 in 2010. Only North Dakota, Hawaii, Alaska, Kansas, Oklahoma and the District of Columbia experienced a slight decline in their median age The Census Bureau also released county-level demographic data, mostly mirroring that of states. Between 2010 and 2012, the median age rose in 2,557 counties, dropped in 510 and remained unchanged in 154. The following map shows changes in counties' median age, comparing 2010 and July 2012 figures. Counties shown in dark green recorded the highest increases in their median age. (Click to open full-screen interactive map in new window) New figures also provide detailed estimates for race, ethnic groups and gender. Other findings include:

Total deaths exceed births for non-Hispanic whites for the first time. Asians were the fastest-growing race or ethnic group in terms of percentage change. Since July 2011, six counties became majority-minority: Mecklenburg (N.C.), Cherokee (Okla.), Texas (Okla.), Bell (Texas), Hockley (Texas) and Terrell (Texas). The Hispanic population increased by 1.1 million from July 2011 through 2012 to more than 53 million, mostly driven by births as opposed to migration.
Census county-level maps:
New 2012 Age Demographics
Baby Boomer Population Map
2010-2012 Population Growth Map