• Male Age: While age-related chromosomal abnormalities in sperm increase slightly, male age has a relatively minor impact on IVF success rates.  

• Female Age: In contrast, female age has a significant effect on IVF outcomes. As women age, their egg quality declines, leading to a higher risk of chromosomal abnormalities (aneuploidy) in embryos.  

Even if sperm fertilization remains unaffected, aneuploid embryos are less likely to develop properly, reducing the chances of:  

• Successful in vitro development  

• Implantation after transfer  

• A healthy ongoing pregnancy  

This is why maternal age is one of the strongest predictors of IVF success.