This study reviews the research on how raising the kindergarten entry age affects elementary- and middle-school test scores; achievement gaps between subgroups; grade retention, high school graduation, and college enrollment rates; and wages as adults.
Cannon, J., & Lipscomb, S. (2008). Changing the Kindergarten Cutoff Date: Effects on California Students and Schools. San Francisco: Public Policy Institute of California.
http://www.ppic.org/content/pubs/op/OP_508JCOP.pdf
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