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Some risks of having children at older ages are widely documented, and the "biological clock" is a popular media concern, but the association between cognitive disability generally and both mothers' and fathers' age is not well known. This article assesses descriptively the relationship between children's cognitive disability and parents' age at birth, using a sample of 353,119 children aged five to eleven living with two married parents from the 2009-2011 American Community Survey. Cognitivedoi:10.15195/v1.a8 fatcat:5n3jdsfkurfltcuk5hdhc3fbhu