 In Beltsville the population was spread out with 23.6% under the age of 18, 10.3% from 18 to 24, 34.5% from 25 to 44, 22.6% from 45 to 64, and 8.9% who were 65 years of age or older.The median age was 35 years.For every 100 females, there were 94.5 males.