The Enterobacteriaceae are a family of Bacteria, included in the gamma subdivision of the Proteobacteria group. Some of the genera included in this family are:
... out with 21.7% under the age of 18, 5.1% from 18 to 24, 32.6% from 25 to 44, 31.2% from 45 to 64, and 9.4% who are 65 years of age or older. The median age is 42 years. ...