If you are researching books for younger audiences or just helping a young person try to navigate the Internet, Google has a feature that will let you set the specific reading level on search results.

For instance, a middle school science teacher looking up earthquakes might want different search results than a geologist that wants up-to-date research on a subject. To search Google by reading level, Google has published the following steps:

1. Click the  gear icon in the top right corner of the search results page.
2. Click Advanced Search.
3. Next to “Reading level” within the “Need more tools” section, select your desired reading level (basic, intermediate, or advanced) or choose to show all results annotated with reading levels.

UPDATE: Follow this link for another way to set your Google reading preferences.