Intrauterine Insemination (IUI) is one of the most popular and affordable fertility treatments for couples trying to conceive. Many couples choose IUI treatment because it offers advanced fertility care with high success rates. However, the outcome of an IUI cycle depends on several factors—especially age, medical conditions, and lifestyle. Understanding these can help you make informed decisions and improve your chances of pregnancy. How Age Affects IUI Success Rates Age plays the most crucial role in IUI outcomes. Fertility naturally declines with age, and this affects both egg and sperm quality. IUI Success Rates by Age (approximate): Under 30 years: 15–20% per cycle 30–35 years: 12–15% per cycle 35–40 years: 8–12% per cycle Above 40 years: 5% or lower per cycle Women in their 20s and early 30s generally respond better to ovulation-stimulating medications and produce healthier eggs, increasing the chances of pregnancy. For women above 35, suc...