In the U.S., the average age for first-time fathers has climbed to about 31, and men aged 50 and older now make up 1.3% of all fathers, signaling a shift toward later fatherhood
A 2025 Nature study found that sperm accumulate genetic mutations with age, including "selfish" mutations that expand within the testes and increase risks of neurodevelopmental and childhood disorders
A companion analysis of over 54,000 families confirmed these mutations are passed to children. This shows that paternal age directly shapes genetic inheritance through natural selection within sperm-producing cell
Modern factors like endocrine disruptors, microplastics, obesity, stress, alcohol, smoking, and EMF exposure are accelerating sperm decline across all ages and contributing to the global drop in sperm counts
Simple, preventive actions, including maintaining a healthy weight, minimizing toxins, managing stress, and considering early sperm screening or preservation, can help protect fertility

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