Deming, David; Dynarski, Susan - In: Journal of Economic Perspectives 22 (2008) 3, pp. 71-92
Over the past 40 years, the age at which children enter first grade has slowly drifted upward. In the fall of 1968, 96 percent of six-year-old children were enrolled in first grade or above. By 2005, the proportion had dropped to 84 percent, mainly because a substantial share of six-year-olds...