Older Men's Sperm Have More Mutations, Potentially Harmful

Research shows that as men age, their sperm accumulate more mutations, some of which are harmful and linked to developmental disorders and cancers, increasing the potential health risks for their children. The study highlights the role of 'selfish' mutations that outcompete others in the testes, with mutation rates rising from 2% in men in their 30s to about 4.5% in men over 70, though not all mutations are necessarily passed on or harmful. Further research is needed to understand the full impact on offspring health.