
It is well established that advanced paternal age is associated with low sperm count/quality and infertility. However paternal ageing has also another facet and it is increasingly recognised that it poses risks to children’s physical and mental health. In this presentation I will discuss our current understanding of so-called de novo mutations, their origin, prevalence, importance in human disease and the impact of paternal age on their occurrence. Understanding the risks associated with delayed parenthood should be an important factor when advising couples seeking to use ART.