Chances of Getting Pregnant by Age: Monthly and Cumulative Rates
Per-cycle and 12-month pregnancy rates by age group — without the cliff-edge mythology — plus what drives the numbers and what they don't predict about you.
"Chances of getting pregnant at X" is one of the most-searched fertility questions, and the data is often dramatized in both directions. Here are the real per-cycle and cumulative numbers by age, and what they do and don't tell you about your individual situation.
What are your chances of getting pregnant each month by age?
Per-cycle chance of pregnancy for a healthy couple with regular cycles and well-timed sex: - Under 30: approximately 25% - 30–34: approximately 20% - 35–37: approximately 15% - 38–40: approximately 10% - 41–43: approximately 5% - 44 and older: 1–2% These are population-level estimates. Individual variation within each age band is wide and depends on cycle regularity, sperm quality, and other factors.
What are cumulative pregnancy rates over 12 months by age?
Cumulative 12-month rates for the same healthy couple: - Under 35: approximately 85% - 35–37: approximately 75% - 38–40: approximately 60% - 41–43: approximately 35% - 44 and older: under 15% Wide individual variation exists within every band.
At what age does female fertility start to decline significantly?
The "fertility cliff at 35" is inaccurate. The decline is gradual and steepens around ages 37–38 — not a dropoff at midnight on a 35th birthday. Most 35-year-olds are closer to 34 on the fertility curve than to 40. The label "advanced maternal age" at 35 is a clinical risk category for certain obstetric complications, not an accurate description of when fertility meaningfully changes.
How does egg quality change with age?
Egg quantity — measured by AMH and antral follicle count — declines roughly linearly with age. Egg quality — driven by chromosomal integrity — declines faster after approximately age 37 and sharply after 40. These are related but distinct processes. Someone can have a low egg count (reserve) but still good egg quality, or vice versa.
What does the miscarriage rate look like at different ages?
Rising aneuploidy — chromosomal errors in eggs — drives a higher miscarriage rate as age increases: approximately 15% at age 30, approximately 25% at 38, and approximately 35–40% at 42. More conceptions occur in older cycles than population data suggests; fewer survive the first trimester. This is why miscarriage becomes more common with age even when conception is still possible.