The anus, in anatomy, is the external opening of the rectum. It is controlled by sphinctermuscles. Faeces are expelled from the body through the anus during the act of defecation, which is the primary function of the anus.
... the population is spread out with 25.2% under the age of 18, 4.8% from 18 to 24, 27.3% from 25 to 44, 28.7% from 45 to 64, and 13.9% who are 65 years of age or older. ...