Weboct 4, 2024 · on average, a 3rd grader is usually around 8 to 9 years old. Now, of course, there can be slight variations depending on when a child’s birthday falls, but this age range is generally applicable across the united states. Websep 17, 2024 · fourth graders are 9 years old for most of the school year. They can start the year at age 8 if their birthday falls between the beginning of the school year and. Webstudents in the usa will usually commence their final year, 12th…