Parental ages at birth of children with pervasive developmental disorders are higher than those of children in the general population.

To examine whether parental ages at birth of children with pervasive developmental disorders (PDD) are elevated, maternal/paternal ages at birth of 309 PDD children born in 1993-2003 (mean age, 8.4 years) were compared with those of children in the Japanese national statistics (general population). The mean maternal/paternal ages (years) at birth of PDD children of 31.7/34.6 were significantly higher even than the highest mean maternal/paternal ages at birth of children of 31.2/33.6 in the national statistics in 2003. This first Japanese study to report elevated parental ages at birth of PDD children underscores the need of further extensive studies.