This table shows the frequency of different types of abuse across different age groups. For example, 21.8 percent of the total number of mistreatment cases involve neglect of children under the age of four. As you can see, neglect becomes less common as children get older, while sexual abuse becomes more common. All types of abuse decrease by the late teens. These statistics come from the 2007 report on Child Mistreatment by the U.S. Department of Health and Human Services.