Это высказывание Уильяма Ослера.

См. S. Saha, A. G. Bainett, C. Foldi, T. H. Burne, D. W. Eyles, S. L. Buka, J. J. McGrath. “Advanced Paternal Age Is Associated with Impaired Neurocognitive Outcomes During Infancy and Childhood” / PLoS Medicine 6 (2009): el000040.