A new study draws attention to the social consequences of a decades-old trend in parenting: having kids start school a year later. For years, research showing the benefits of being an older first-grader, as well as the experience of countries like Finland where schooling doesn’t start until age seven, has encouraged parents and teachers to “redshirt” kids. In 1968, 96% of six-year-olds were enrolled in first grade or above. By 2005, that number had fallen to 84%. The percentage of six-year-olds enrolled in school, meanwhile, stayed about the same. What does that mean for late-starting schoolchildren years down the road — and for the rest of us?

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Kindergarteners are getting older and older. (Getty Images)

Harvard’s David Deming and Susan Dynarski, in an NBER working paper published this month, write that “increasing age at school entry intensifies inequality in human capital and social welfare.” Kids who start school a year late have one year less schooling before they reach the age at which they’re allowed to drop out, decreasing their average educational attainment and widening the gap in learning between rich and poor. (Low-income teenagers are more likely to drop out.) And those who do stay in school enter the labor force a year later — decreasing their average lifetime earnings as well as their contribution to Social Security.

Deming and Dynarski note that, in the last 40 years, almost every state has raised the age at which children can start school. “This change is remarkable,” they write, “given the strong evidence that, in the United States, starting school later decreases educational attainment.” With the U.S. having fallen to the back of the pack in terms of the education of its schoolchildren, this issue is something to pay attention to. –Anton Troianovski