Kids in 3rd grade are 8 years old and 20% have cell phones

Kids in the third grade are, on average, eight years old. Nowadays, 20 percent of third-grade boys and 18 percent of third-grade girls already have a cell phone, according to a 2011 study of 20,766 Massachusetts elementary, middle, and high school students. By the time the kids reach fifth grade, 39% of the kids have …