IVF Success Rates Over 40: What the HFEA Data Shows

Success rate statistics do strange things to people. For some women they bring a kind of relief — a number to hold, something concrete in a process that otherwise feels entirely outside your control. For others the same figures land as a verdict. A door closing.

Neither reaction is wrong. But both miss something important: IVF success rate data describes a population. It tells you what happened, on average, across thousands of women who went through treatment. It does not tell you where you sit within that population, and it says nothing about the women who sit outside it entirely — the outliers, whose stories rarely appear in the statistics.

One more thing worth saying upfront: the HFEA data covers live births from IVF treatment only. It does not count natural conceptions, which are not tracked or reported in the same way. Women over 40 do conceive naturally — with a partner, with a known donor, unexpectedly — and those pregnancies do not appear anywhere in this data. The statistics describe one path to a baby. They are not a description of all the paths.

I started IVF at 43 as a solo woman. I went through two failed cycles. Two separate clinics recommended I move to donor eggs. I eventually conceived naturally with a known donor — he was 38, I was almost 44 — and my daughter was born shortly after. That outcome does not appear in any success rate table. Paths to a baby can be genuinely unpredictable, in both directions.

With that context: here is what the HFEA data actually shows, and how to read it usefully rather than as a final word.

The HFEA — the Human Fertilisation and Embryology Authority, which regulates all licensed fertility clinics in the UK — publishes national IVF outcome data using live birth rate as its primary measure. That is the figure worth knowing.

The Age Effect on IVF Success Rates

IVF success rates decline with age because egg quality declines with age. This is the central clinical fact of fertility treatment over 40, and it's reflected clearly in the HFEA data.

Approximate national averages from HFEA published data, own eggs, live birth rate per cycle started. Individual clinic results vary. Source: HFEA.

The drop between 38–39 and 40–42 is significant. The drop between 40–42 and 43–44 is steeper still. At 43–44 using your own eggs, the HFEA data puts the national average live birth rate per cycle at roughly 3–5%. That is not a figure most clinics lead with in a first consultation.

What Changes at Each Age

IVF success rates at 40–41

At 40–41, the picture is meaningfully different from the early 40s. Live birth rates per cycle sit in the region of 10–15% nationally — lower than your 30s, but not negligible. Many women at this age will have a reasonable number of eggs retrieved and can expect at least one or two viable embryos from a cycle. The challenge is often not stimulation response but embryo quality — a higher proportion of embryos are chromosomally abnormal at this age than in younger women.

IVF success rates at 42–43

At 42–43, the picture becomes more variable. The national average drops to the lower end of the 8–12% range and below. Response to stimulation becomes less predictable. Some women at this age will respond well and produce several eggs; others will have a diminished response. The proportion of chromosomally normal embryos is lower again. For women in this age group, clinics will typically raise the question of preimplantation genetic testing (PGT) to identify viable embryos before transfer — though this adds cost and is not straightforward.

IVF success rates at 44 and over

At 44 and over using own eggs, the HFEA data puts the national live birth rate per cycle at under 2%. Most fertility specialists will be direct about this at consultation. Some women in this age group do have successful cycles with their own eggs — the statistics describe a population, not an individual — but the clinical picture is one of very low probability per cycle, and most women who pursue treatment at this age will be advised to consider donor eggs seriously.

Why Donor Eggs Change Everything

Donor egg IVF produces substantially different results because egg quality — the primary driver of age-related decline — is determined by the donor's age, not yours.

With donor eggs, your age at treatment has very little effect on success rates. The figure that matters is the donor's age at egg collection — which is why most clinics source eggs from donors under 35. The recipient's uterus, at 40, 43, or 46, can carry a pregnancy just as well as a younger woman's. It is egg quality alone that the age-related decline affects.

This is why the clinical recommendation to move to donor eggs is so common for women over 42. The numbers make a straightforward case. What the numbers do not resolve is whether that decision is right for you — which involves your feelings about genetic connection, your financial situation, and what you are and are not prepared to go through. The own eggs vs donor eggs article covers that decision in more detail.

Per-Cycle vs Cumulative Rates

The figures above are per cycle started. Clinics sometimes present cumulative rates — your chance of a live birth across two, three, or four cycles — which are higher and can look more reassuring. They are not wrong, but they require that you complete those cycles, which depends on cost, physical response, and what each cycle shows.

For women over 40 using their own eggs, cumulative rates across multiple cycles are genuinely higher than any single cycle suggests. But each cycle also gives you new information — about how you respond to stimulation, embryo quality, and whether to continue. The cumulative figure assumes you will keep going regardless.

What the Statistics Cannot Tell You

National averages describe what happened across thousands of treatment cycles. They do not describe your situation specifically, because your situation depends on things the averages do not capture:

• Your AMH and AFC — your ovarian reserve markers tell you something about how your ovaries are likely to respond to stimulation. A woman of 42 with a relatively good AMH is in a different position from a woman of 42 with a very low AMH, even though the national average treats them as the same.
• Your previous cycle history — if you have been through one or more cycles, the results of those cycles — number of eggs retrieved, fertilisation rate, embryo quality — are more directly relevant to your next cycle than the national average.
• Your clinic's specific data — national averages mask significant variation between clinics. A clinic with higher-than-average results for women your age is a meaningfully different proposition. The HFEA's clinic-by-clinic data lets you check this.

The question worth asking any clinic before you start treatment: "What is your live birth rate per cycle started, for women my age, using their own eggs, over the last three years?" That is the number that applies to your situation — not the headline figure, not the all-ages average, not the donor egg rate.

Your AMH result in context explains what your ovarian reserve markers do and don't tell you — and why a single test number is never the whole picture.

Reading Your Clinic's Published Figures

The HFEA requires all licensed clinics to publish their outcome data, accessible at hfea.gov.uk. When you read those figures, check:

• Live birth rate or pregnancy rate? A positive pregnancy test and a live birth are very different outcomes. The number that matters is live birth.
• Per cycle started or per embryo transfer? Per-transfer figures exclude cycles that were cancelled before transfer — which makes the numbers look better by removing the difficult cases.
• Own eggs or donor eggs? If donor egg cycles are included in the overall figure, the headline rate will be higher than what a woman using her own eggs can expect.
• What age group? A clinic's headline figure nearly always represents its best age group.
• How many patients? A small clinic treating 20 patients your age has a published figure that is statistically much less reliable than one treating 200.