IVF success rates decline with age, primarily because egg quality decreases. Using your own eggs, live birth rates per retrieval cycle range from approximately 50–55% for women under 35 to around 3–5% for women over 42. Using donor eggs largely eliminates the age factor, with success rates of 50–60% regardless of the recipient’s age.
- Age is the single most important predictor of IVF success, but it’s the age of the eggs that matters, not the age of the uterus
- Cumulative success rates (multiple cycles) are significantly higher than per-cycle rates — most couples need 2–3 cycles
- Clinic-reported success rates can be misleading; patient selection, reporting methods, and definitions of “success” vary widely
- PGT-A genetic testing can improve per-transfer success rates but does not change the overall number of genetically normal embryos your cycle produces
- Donor eggs effectively reset the age clock, making IVF viable well into the 40s
IVF Success Rates by Age: The Numbers
The most reliable US data comes from the CDC’s Assisted Reproductive Technology (ART) Surveillance System and the Society for Assisted Reproductive Technology (SART). These are the latest published national averages for IVF cycles using the patient’s own eggs:
| Age Group | Live Birth Rate Per Retrieval | Live Birth Rate Per Transfer | Miscarriage Rate |
|---|---|---|---|
| Under 35 | 50–55% | 55–60% | 10–15% |
| 35–37 | 38–42% | 45–50% | 15–20% |
| 38–40 | 25–30% | 35–40% | 20–28% |
| 41–42 | 12–18% | 20–25% | 30–38% |
| Over 42 | 3–5% | 8–12% | 40–50% |
| Donor eggs (any recipient age) | 50–60% | 55–65% | 10–15% |
Per-transfer rates look higher because they exclude patients who never made it to transfer (no viable embryos, cycle cancellation). Per-retrieval rates are more honest because they include everyone who started a cycle. Always ask your clinic which metric they’re quoting.
Why Age Matters So Much
The primary reason IVF success declines with age is egg quality, not egg quantity or uterine health. As eggs age, they accumulate chromosomal errors (aneuploidy). By age 40, more than half of all embryos are chromosomally abnormal. By 43, that number exceeds 80%.
This is why donor eggs from younger women produce success rates that mirror the donor’s age, regardless of how old the recipient is. A 45-year-old using eggs from a 25-year-old donor will have success rates comparable to a 25-year-old using her own eggs.
Cumulative Success: The Number Your Clinic Should Quote
Single-cycle statistics paint an incomplete picture. Most patients need multiple cycles, and cumulative success rates are significantly more encouraging:
| Age | 1 Cycle | 2 Cycles | 3 Cycles |
|---|---|---|---|
| Under 35 | 50–55% | 75–80% | 85–90% |
| 35–37 | 38–42% | 60–68% | 72–80% |
| 38–40 | 25–30% | 43–51% | 55–63% |
| 41–42 | 12–18% | 22–32% | 30–42% |
After three cycles, the vast majority of women under 38 will achieve a live birth. Even for women 41–42, cumulative rates after multiple cycles are substantially higher than the single-cycle numbers that often dominate the conversation.
How to Read Clinic Success Rates Without Getting Misled
Clinic success rates published on SART.org and the CDC ART dashboard are real data, but they require careful interpretation:
Patient Selection Bias
Clinics that accept more complex cases (older patients, diminished ovarian reserve, multiple failed cycles) will naturally have lower reported success rates than clinics that cherry-pick patients. A lower number doesn’t necessarily mean worse care.
Cancellation Rates
Some clinics cancel cycles early rather than proceed with a low chance of success. This improves their per-transfer statistics but doesn’t help the patient who was cancelled. Ask about cancellation rates alongside success rates.
Fresh vs Frozen
The industry has shifted heavily toward freeze-all protocols and frozen embryo transfers (FET). Make sure you’re comparing apples to apples when looking at clinic data. FET success rates are now comparable to or better than fresh transfer rates at most clinics.
Instead of “What are your success rates?” ask your clinic: “For patients with my specific diagnosis, age, and AMH level, what is the expected live birth rate per retrieval cycle at your clinic?” National averages are useful benchmarks, but your individual prognosis depends on your unique combination of factors.
Factors Beyond Age That Affect Success
While age is the dominant variable, several other factors influence your individual prognosis:
- AMH (Anti-Müllerian Hormone): Reflects ovarian reserve. Low AMH doesn’t necessarily mean poor egg quality, but it may mean fewer eggs per retrieval
- BMI: Both very low and very high BMI can reduce success rates. The ASRM notes that obesity can reduce IVF success by 10–20%
- Male factor: Severe male factor infertility can reduce fertilization rates even with ICSI
- Diagnosis: Endometriosis, diminished ovarian reserve, and uterine abnormalities each affect outcomes differently
- Number of prior cycles: Success rates per cycle tend to decline after 3–4 failed cycles, though this varies by cause
- Lifestyle factors: Smoking reduces IVF success by approximately 50%. Alcohol consumption and extreme exercise may also affect outcomes
When the Numbers Aren’t in Your Favor
If you’re over 40 using your own eggs, the statistics are challenging. That doesn’t mean they’re hopeless, but it does mean having an honest conversation with your RE about:
- Mini IVF or natural cycle IVF as lower-cost alternatives when expected egg yield is low
- Donor eggs as a path to success rates that effectively reset the age clock
- Multiple cycle planning — banking embryos across several retrievals before attempting transfer
- Realistic budgeting for 3+ cycles rather than emotionally and financially planning for one
For a detailed cost comparison of these options, see our IVF Medication Costs breakdown.