Fertility and Age – The Real UK Statistics

Fertility naturally declines with age due to changes in egg quality, ovarian reserve and hormone regulation. This guide summarises the real UK data on fertility decline to help explain what age-related change looks like. Women's Fertility Timeline Peak Fertility Early-to-mid 20s. Age 30–34 Gradual decline begins. Age 35–37 More noticeable changes in ovarian reserve and egg quality. Age 38–40 Steeper decline; increased aneuploidy rates. 40–45 Fertility becomes significantly lower. Pregnancy Chances by Age (General UK Statistics) Age 30: ~20–25% chance per cycle Age 35: ~15–20% Age 40: ~5–10% Age 43+: < 5% Why Fertility Declines with Age fewer eggs remaining increased chromosomal abnormalities reduced mitochondrial function changes in hormone signalling (e.g., higher FSH) Egg Freezing and Age Egg freezing earlier (under 35) typically offers the best future options. Related Guides Understand Your Fertility Status AMH Test: What Your Results Mean — key indicator of ovarian reserve and fertility potential FSH Levels by Age — hormone changes with age AFC (Antral Follicle Count) — remaining egg supply assessment Day 2/3 Hormone Testing — baseline fertility assessment Egg Freezing and Preservation Egg Freezing Success Rates by Age — success rates at different ages How Many Eggs Do You Need to Freeze — age-specific targets Egg Freezing Costs UK — financial planning IVF and Treatment Pla