Parent-Teacher-Communication-8-Ways-to-Start-on-the-Right-Foot-this-School-Year-Photo4According to the National Center for Education Statistics, about 10 percent of kindergarteners in United States now begin at the age of six. Research by the center indicates that older children do outperform younger ones in kindergarten, but the authors of the study caution that part of this discrepancy might be due in part to the fact that redshirted children tend to come from middle- and upper-class homes with educated parents.