According to research from the Pew Institute linked here over 71% of Americans use the Internet. And it not just kids online, well over 80% of people 30 to 49 years old use the Internet. The only age group with less than 50% usage is people over 65. In addition the research shows that Internet usage is closely related to education and income. The highest percentage of users (over 90%) are people with a college education and in the upper income groups.
An amazing 80% of people in the surveys used the Internet to look for medical information. The only activities that were used more often were e-mail, general information and finding driving directions.