As of 2010, there were 105,000 people in St. Marys County,[REF] up from 84,000 in the year 2000 [REF].
In the county, the population was spread out with 27.90% under the age of 18, 15.70%[REF] from 18 to 24, 29.50%[REF] from 25 to 44, 22.20%[REF] from 45 to 64, and 9.10% who were 65 years of age or older.