 About 7.10% of families and 10.20% of the population were below the poverty line, including 13.00% of those under age 18 and 12.50% of those age 65 or over.Although the county's 2008 population is only 31,000, it is one of the fastest-growing in Virginia, as people have moved near Lake Anna.At least 15 new housing developments have sprouted in five years.