IVF Success Rates by Age — What the Data Actually Shows

Age is the single most important factor in IVF success, far outweighing protocol details, clinic choice or supplements. This page presents age-stratified IVF outcome data honestly, explains the biology behind it, and discusses what these numbers mean for planning.

1. The honest numbers, per-cycle live birth

Approximate live birth rates per cycle initiated with own eggs (international registry data): under 35: 40–50%; 35–37: 30–40%; 38–40: 20–25%; 41–42: 10–15%; over 42 (own eggs): under 5%. These are aggregate; individual prognosis varies with AMH, AFC, prior response and other factors.

2. The biology, egg quality

Female fertility is dominated by egg quality, which declines as women age due to accumulating chromosomal errors during meiosis. Aneuploidy rates rise sharply after 35 and dramatically after 37. By age 42, over 80% of eggs may be aneuploid. No technique meaningfully reverses this biology.

3. Cumulative success across cycles

Per-cycle numbers underestimate the realistic experience. Cumulative live birth across 3 cycles approaches: under 35: 70–80%; 35–37: 60–70%; 38–40: 40–50%; 41–42: 20–30%. Many couples achieve pregnancy in cycle 2 or 3, not cycle 1.

4. Donor egg, resets the age curve

Donor egg cycles use eggs from a typically much younger donor. Recipient age has minimal effect on success, donor age determines outcomes. Donor egg IVF typically achieves 50–60% live birth rate per cycle regardless of recipient age. Powerful option for women over 42, premature ovarian insufficiency, or repeated failure with own eggs.

5. PGT-A — when age makes it valuable

Preimplantation genetic testing for aneuploidy reduces miscarriage and time-to-pregnancy in older women. Benefit becomes meaningful from age 37–38 and substantial over 40. PGT-A does not increase the absolute number of normal embryos a couple has, but identifies them efficiently, reducing failed transfers and miscarriages.

6. AMH and AFC — the personal numbers

Age gives population-level data; AMH and antral follicle count give your personal data. Within any age group, AMH varies widely. Two 35-year-olds with AMH of 0.5 vs 4.0 ng/ml have very different prognoses. Use age plus reserve markers together, not in isolation.

7. Planning the cumulative journey

Plan emotionally and financially for 2–3 cycles, not 1. Most successful pregnancies happen in cycles 2 or 3 across all age groups. A single failed cycle does not predict failure. Stopping rules and donor egg options should be discussed proactively, not in crisis.

8. What this means for individual decisions

For couples in their early 30s, time is on your side, consider lifestyle optimisation, address surgical issues if relevant, IVF if specific indications. For couples over 38, time-efficiency matters — IVF directly often beats prolonged IUI. Over 42, donor egg discussion belongs early, not as last resort.

Frequently Asked Questions