Paternal and maternal ages at conception and risk of bipolar affective disorder in their offspring.

A consistent association between paternal age and their offspring's risk of schizophrenia has been observed, with no independent association with maternal age.

http://www.ncbi.nlm.nih.gov/pubmed/19627644?ordinalpos=2&itool=Email.EmailReport.Pubmed_ReportSelector.Pubmed_RVDocSum