The county population contained 23.5% under the age of 18, 6.2% from 18 to 24, 32.90% from 25 to 44, 28.7% from 45 to 64, and 10.3% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 98.02 males. For every 100 females age 18 and over, there were 97.03 males. The median income for a household in the county was $79,735, and the median income for a family was $92,497. The per capita income for the county was $36,786. About 5.2% of the population was below the poverty line.